The correct answer is C. would have been elected.
The sentence is in the past perfect conditional tense, which is used to talk about hypothetical situations that did not happen. In this case, the speaker is saying that if the woman had worked hard, she would have been elected.
The verb “elect” means to choose someone to hold a position of power. In this sentence, the woman is running for office, and the speaker is saying that if she had worked hard, she would have been elected.
The other options are incorrect because they do not agree with the tense of the sentence. Option A, “will elect,” is in the future tense, which is not appropriate for a hypothetical situation. Option B, “will be elected,” is also in the future tense, and it is also incorrect because it does not agree with the subject of the sentence. The subject of the sentence is “she,” which is singular, but the verb “will be elected” is plural. Option D, “would have elected,” is in the past perfect tense, but it is also incorrect because it does not agree with the meaning of the sentence. The speaker is saying that the woman would have been elected, not that she would have elected someone else.