Read the sentence.

We went to Phoenix, which is the capital of Arizona.

What is the linking verb?

a is

b which

c to

d went

d went

The linking verb in the given sentence is "is". To identify the linking verb in a sentence, you need to search for a verb that connects the subject ("which") with additional information or describes the subject. In this case, "is" links the subject "Phoenix" with the predicate "the capital of Arizona". Therefore, the correct answer is option a) "is".

The linking verb in the sentence is "is." So the answer is a) is.