Which sentence does not contain any errors in comma usage?

a. look at all those tiny gray, kittens!

b. i learned about ancient cave art in the history lesson.

c. here is a mug of hot, and creamy cocoa.

d. my sore tired achy muscles need a rest.

Johnny just received a failing grade on his science exam. lucy oversaw johnny’s paper, and she asked him about it. johnny snapped at her shouting, “it’s none of your business! ” which of the following is the psychological response johnny exhibited towards lucy? select one: a. dismay b. irritability c. hesitation d. hopelessness