Which sentence shows correct comma usage?
A. Azucena studied for hours on Thursday night yet, she failed the test on
Friday morning.
B. Azucena studied for hours on Thursday night yet she failed the test, on
Friday morning.
C. Azucena studied for hours on Thursday night, yet she failed the test on
Friday morning.
D. Azucena studied, for hours, on Thursday night, yet she failed the test on
Friday morning