7a. I was interested in working on the presidential campaign if the opportunity still exists.

7b. I am interested in working on the presidential campaign if the opportunity still exists.
my answer is B. I need a rationale for this answer.thanks

Your answer is correct.

The problem with the first sentence is that "was interested" is in the past tense, yet you clearly want it in the present tense.

thank you

The answer to the question is indeed option B: "I am interested in working on the presidential campaign if the opportunity still exists." Here's the rationale for choosing option B:

1. Verb Tense Agreement: The first part of the sentence "I am interested" indicates that the speaker's interest is in the present moment. When expressing current or ongoing interests, it is appropriate to use the present tense ("am") to show that the interest still exists.

2. Conditional Statement: The phrase "if the opportunity still exists" suggests that the speaker is unsure if the opportunity to work on the presidential campaign is still available. In this situation, the use of the present tense ("exists") in option B correctly indicates a condition that is yet to be determined.

Option A, "I was interested in working on the presidential campaign if the opportunity still exists," contains verb tense inconsistency. The past tense "was" contradicts the present moment interest expressed in the sentence. Therefore, option B is the correct choice based on the rationale provided.