Answer:
C
Step-by-step explanation:
The verb that makes an incorrect shift in tense is C. "is." The sentence is written in the past tense, as indicated by the verbs "buzzed" and "knew," which are both in the past tense. However, the verb "is" is in the present tense. To maintain consistency in tense, it should be changed to the past tense "was," as in "It was the day of the big race."