Final answer:
The sentence with the verb tense shift is 'Occasionally, Steve's boa escapes and startles someone in the kitchen,' which switches from present to simple past tense within the same clause. The correct answer is option 2.
Step-by-step explanation:
The sentence that has a shift in verb tense is "Occasionally, Steve's boa escapes and startles someone in the kitchen." The initial verb 'escapes' is in the present tense, but it improperly shifts to 'startles' in the simple past tense within the same clause.
To maintain verb tense consistency, the sentence should be corrected to "Occasionally, Steve's boa escapes and startles someone in the kitchen."