One of the rules in English language states that, when the phrase 'it is time', 'it is high time', or it is about time' is used in a sentence, the verb that follows must be in the past form.

It is used to say it is time to do something that should have been done a long time ago

For instance, a statement reads; It's high time we made (not make) some changes around here. The verb 'made' is in its past tense. Therefore option E 'expelled' is the correct option, because the verb is in its past tense and correctly fills in the gap.