Question

select the best way to punctuate the natural pause in the sentence below.
hector finds it hard to concentrate in math class especially when he is hungry for lunch.
hector finds it hard to concentrate in math class especially when—he is hungry for lunch.
hector finds it hard to concentrate in math class, especially when he is hungry for lunch.
hector finds it hard to concentrate, in math class especially when he is hungry for lunch.
hector finds it hard to concentrate . . . in math class especially when he is hungry for lunch.

Explanation:

The sentence has a natural pause before the dependent clause "especially when he is hungry for lunch" that adds extra context. A comma correctly separates the main independent clause from this additional, non-essential dependent clause. The other options use incorrect punctuation: em dashes here are unnecessary, the comma after "concentrate" misplaces the pause, and ellipses do not fit the natural pause in this context.

Answer:

B. Hector finds it hard to concentrate in math class, especially when he is hungry for lunch.