A linking verb, as the name itself says, is used to link, or to connect parts of a sentence. In this sentence, there are two verbs - went and is. However, went is not a linking verb but rather a main verb. This means that the linking verb is IS.
I believe the answer would be the first option :)
Answer: I want to be a chef beacause cooking is a great hobby.
Explanation:
B. Maltke, our club secretary, takes.
