Fill in the blank with the most suitable verb:
How many people ________ you invited to the party?
A verb is used to express an occurrence, action, or state. It is the grammatical centre of the predicate in a sentence.
An auxiliary verb is a verb which gives is used in the formation of tenses, moods, tones, etc.
Option B is correct as the subject is you and the sentence suggests of present perfect tense (traveled). Have is used as an auxiliary verb here, the main verb is invite.
The other options are wrong as the main verb (invite) is in its third form and have is used as an auxiliary verb here.
The correct answer is B)have