Final answer:
In the sentence provided, 'The answer that you are seeking may be difficult to find,' the adjectival clause is 'that you are seeking' and the relative pronoun that begins this clause is 'c. that'. The relative pronoun 'that' connects the clause to the noun 'answer', modifying it.
Step-by-step explanation:
The relative pronoun that begins the adjectival clause in the sentence "The answer that you are seeking may be difficult to find" is c. that.
Adjectival clauses, also known as relative clauses, provide additional information about a noun in the sentence. They are typically introduced by relative pronouns like who, which, that, and whom. The relative pronoun "that" in the given sentence serves to connect the adjectival clause "that you are seeking" to the noun "answer", thereby modifying it with additional information.
Here's another example for clarification: "Janis spent her vacation in Goa, which is on the west coast of the Indian subcontinent." In this case, the relative pronoun which begins the adjectival clause 'which is on the west coast of the Indian subcontinent,' where it describes the noun 'Goa'.