The correct option is B Is
The subject of the given interrogative sentence is "everybody". Though 'everybody' has a plural meaning, it is considered as a singular unit.
"Are" in option A is incorrect as it is a present indicative plural verb.
"Is" in option B is correct as it is the third person present singular indicative verb. This is in agreement with the singular subject.
"Were" in option C is incorrect as it is a plural past indicative.
"Does" in option D is incorrect as it is used with third person singular pronouns (he, she, it) and with singular noun forms.
Therefore, option B is correct.