Topic: Subject Verb Agreement,

Best Answer Explained in Below-:

The correct choice is B) "has appeared at," and understanding its appropriateness requires a look at subject-verb agreement and collective nouns.

In the question, the phrase "Each of the students" is crucial. Here, "each" is a singular subject, referring to individual students within a group. When "each" is the subject, it requires a singular verb form, regardless of the plurality of the noun it refers to. Therefore, the verb should be "has," which is the singular form of "to have," aligning with the singular subject.

Option A, "have appeared at," is incorrect because "have" is the plural form, which does not agree with "each." Option C, "are appearing at," and option D, "is appearing," also fail to maintain the necessary singular agreement. "Appearing" indicates present continuous tense, which is not appropriate here since the context likely refers to a completed action (i.e., the students have already taken the test).

Thus, the sentence should read: "Each of the students who filled out the admission form has appeared at the test," confirming that the singular subject "each" necessitates the singular verb form "has."