Answer:
A. Will be reading.
Step-by-step explanation:
Verb phrases are those words or groups of words that are an auxiliary or helping verbs, a predicate or a clause. They can also act as an adverb or an adjective, with a double verb in a sentence.
The verb phrase in the sentence
We will be reading Shakespeare's Julius Caesar this spring
is "will be reading". The main verb is "reading" while the helping verb is "will be". The two verbs together make up the "verb phrase". Thus, the verb phrase in the sentence is
"will be reading".