Question

i need an example that is pertinent _____ in this case​

Answer 1

answer

to

explanation

A preposition is a word or phrase that connects a noun or pronoun to a verb or adjective in a sentence. Since the pertinence is concerning the case, the preposition "to" should be used to refer to the relation. Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect.