Hello. You did not show the sentence to which this question refers, which makes it impossible for someone to answer it correctly. However, I will try to help you in the best possible way.
Conditional mode occurs when verbs, within a sentence, are used to make requests, or to explain things that can happen within certain situations, that is, it is also used to explain possibilities. Thus, to find your answer, you must read the original sentence and see which answer options best meet the objectives of the conditional mode in relation to the original sentence.