Question

\monochord\ means?
○ something sent through the mail
○ a person who makes music
○ an instrument with only one string

Explanation:

To determine the meaning of "Monochord", we analyze the roots of the word. "Mono-" means "one", and "chord" (in the context of instruments) relates to strings. The first option refers to mail - related items, the second to a musician. The third option, "an instrument with only one string", matches the meaning of "Monochord" as "mono - " (one) + "chord" (string - related for the instrument).

Answer:

C. an instrument with only one string (assuming the options are labeled A, B, C with A: something sent through the mail, B: a person who makes music, C: an instrument with only one string)