Cody is laughing at Megan's joke when suddenly the phone went dead, He tries calling her back, but she is not answering.
Which of these revisions corrects the inappropriate shift in verb tense?
A. but she did not answer
B. He tried calling her back
C. Cody laughed at Megan's joke
D. when suddenly the phone dies

D. when suddenly the phone dies

Explanation:

Because the rest of the sentence is in present tense.

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.