The correct answer is A.
A subject-verb agreement implies that the subject of the sentence and the verb of the sentence must be in agreement in number.
A pick and shovel ( two things, therefore plural ) are used to remove sand;
When two subjects are joined by and, the verb is plural.
then workers or a crane lifts the artifacts.
When two or more singular nouns or pronouns are connected by or or nor, a singular verb is used. The verb agrees in person and number with the noun nearest to it.
