1. Subject--Verb and Pronoun Agreement
Every finite verb must agree in number with its true subject, and every pronoun must agree in number and gender with its antecedent --- even when other words sit between them.
Ignore intervening prepositional phrases (one of the boxes is missing); compound subjects joined by and take a plural verb; subjects joined by or/nor agree with the nearer subject; collective nouns (team, committee) are usually singular; indefinite pronouns like each, everyone, neither are singular.
A pronoun's antecedent is the noun it replaces, not the nearest noun in the sentence --- Each of the students turned in their essay is a popular ``sounds fine'' error tested on CLEP because each is singular.
The exam buries a plural noun right before the verb (the list of items are long) so test-takers agree the verb with the wrong, nearby noun instead of the true singular subject list.
Find the REAL subject $arrow$ match the verb to IT, not the closest noun.