Question

“and haven’t you any on hand just now?” i asked with interest.
“some ten or twelve, but none which present any feature of interest. they are important, you understand, without being interesting. indeed, i have found that it is usually in unimportant matters that there is a field for the observation, and for the quick analysis of cause and effect which gives the charm to an investigation. the larger crimes are apt to be the simpler, for the bigger the crime the more obvious, as a rule, is the motive. in these cases, save for one rather intricate matter which has been referred to me from marseilles, there is nothing which presents any features of interest. it is possible, however, that i may have something better before very many minutes are over, for this is one of my clients, or i am much mistaken.”
he had risen from his chair and was standing between the parted blinds gazing down into the dull neutral - tinted london street. looking over his shoulder, i saw that on the pavement opposite there stood a large woman with a heavy fur boa round her neck, and a large curling red feather in a broad - brimmed hat which was tilted in a coquettish duchess of devonshire fashion over her ear. from under this great panoply she peeped up in a nervous, hesitating fashion at our windows, while her body oscillated backward and forward, and her fingers fidgeted with her glove buttons. suddenly, with a plunge, as of the swimmer who leaves the bank, she hurried across the road, and we heard the sharp clang of the bell.
“i have seen those symptoms before,” said holmes, throwing his cigarette into the fire. “oscillation upon the pavement always means an affaire de cœur. she would like advice, but is not sure that the matter is not too delicate for communication. and yet even here we may discriminate. when a woman has been seriously wronged by a man she no longer oscillates, and the usual symptom is a broken bell wire. here we may take it that there is a love matter, but that the maiden is not so much angry as perplexed, or grieved. but here she comes in person to resolve our doubts.”
#3 - paragraph 3 is important to the development of the plot because it -
presents the turning point where holmes finds an interesting case
provides a detailed description of the new client
reflects holmes’s judgment of other people
signifies the point where holmes and the narrator meet the woman

Explanation:

Paragraph 3 shows Holmes interpreting the woman's nervous behavior to deduce her situation, which builds his character and sets up the case's context. It centers on his ability to judge people, which drives the plot forward by revealing the nature of the upcoming client's issue before she enters. The other options are incorrect: it is not a turning point for an interesting case (Holmes only anticipates a possible case earlier), it does not provide a detailed physical description (that is Paragraph 2), and the meeting happens after this paragraph.

Answer:

reflects Holmes's judgment of other people