Fill in the blank with the suitable pronoun:
_______ participant of the tournament was asked to submit a registration form.
Each, either, either of and neither are distributive pronouns. ‘Each’ is used to present the members of a group as individuals. Whereas ‘either’, ‘either of’ and ‘neither’ are used when there is a comparison or choice between two things. Since the given sentence is speaking about a number of participants in a tournament, ‘either’, ‘either of’ and ‘neither’ cannot be used. The focus is on the fact that each individual participant is asked to submit a form; not just two. Thus options B, C, and D are incorrect. Thus option A is correct.