read the following short excerpt of student writing. use your vocabulary and grammar knowledge to determine which suggestions you would make to improve his or her grammar and word choice.

i really thought she loved me but i discovered her grave betrayal one afternoon. it was easy to figure out because she accidentally sent a text to me that was meant for him. i was confused by the text because it said, "don't tell mike." i felt insulted that she thought she could get away with this infidelity. at first i felt very angry bitter and hateful but then, i felt so hopeless and depressed. i longed for her to call me. i thought if i could just hear her pleasing voice, maybe then i would not be filled with such bitterness. instead of calling her i talked to another friend who is good at listening and feeling my pain. talking with her makes me feel euphoric. i think i may be on the road to recovery.

which comma rule does this student need to apply to this passage?

i really thought she loved me but i discovered her grave betrayal one afternoon. it was easy to figure out because she accidentally sent a text to me that was meant for him. i was confused by the text because it said, "don't tell mike." i felt insulted that she thought she could get away with this infidelity. at first i felt very angry but then i felt so hopeless and depressed.

use a comma to separate three or more items in a series.
use a comma before a conjunction to separate two complete thoughts.
use a comma to set off a phrase or clause at the beginning of a sentence.
use a comma to separate coordinate adjectives.