Fill in the blanks with the most appropriate linking verbs.
Mary _____ happy, because her pizza ______ good.
In order to fill in the blanks with the most suitable linking verbs, we must understand what linking verbs are. Linking verbs are used to link the subject with it's complement/state or adjective. For example: Roshni is pale. 'Roshni' is the subject and 'pale' defines her state, these two are connected by a linking verb 'is'.
Option B - Has and Tastes are linking verbs. Mary has happy, because her pizza tastes good' is grammatically incorrect, as has is used to show possession of the subject. Happy is not a thing to be owned or possessed. Has is used in present perfect tense and Tastes is used in simple present tense. We can't use different tenses for the actions that happened together, and in the same sentence. Hence, option B is incorrect.
Option C - Become and Tasted are linking verbs. Mary become happy, because her pizza tasted good is grammatically incorrect, as Mary is a singular subject and requires a singular verb form becomes. Also, the tenses of both the clauses do not match. Thought both the verbs are linking verbs, they do not link the given subjects with the complements correctly. Hence, option C is incorrect.
Option D - Was and Grew are linking verbs. Mary was happy, because her pizza grew good is grammatically incorrect, as pizza can't grow to be good. Though the tenses of the verbs are correct, and they are linking verbs, they do not link the subjects with their complements correctly. Hence, option D is incorrect.
Option A - Was and Tasted are linking verbs. Mary was happy, because her pizza tasted good' is grammatically correct because the linking verbs link the subjects Mary and Her pizza with their complements happy and good. Also, the tenses of both the clauses match in the sentence. Hence, option A is the correct answer.