Read the sentence, and choose where a comma should go. Since Mara stopped playing piano the house has been a lot quieter. A
after the word “Mara”

B
after the word “piano”

C
after the word “house”

D
The sentence does not need a comma.

the picture is not clear

explanation:

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

i thinl it is the 1st answer