Kari and Misha, who have known each other since first grade are both yearbook editors and photographers. Where should a comma be placed in this sentence?

A. after “editors”
B. after “both”
C. after “grade”
D. after “other”

C.

Explanation:

A comma should be placed after "grade": Kari and Misha, who have known each other since first grade, are both yearbook editors and photographers.

the correct answer is:

this is an example of the writer telling through description rather than showing through dialogue.

sometimes writers like to explain explicitely what's happening instead of adding dialogues of the situations., which is the case in this passage,

so whats the question?