Answer:
a). Adjective or relative clause.
b). It functions to modify the noun 'bees.'
Explanation:
The Adjectival clause, which is also popularly known as the relative clause, is characterized as the dependent clause that primarily functions to modify or qualify a noun or pronoun by providing details/descriptions about them.
In the given sentence, the clause 'which...attack' is the adjectival clause as it functions to modify the noun 'bees' in the sentence. It is dependent as it begins with a relative pronoun 'which' and thus, it requires the principal clause to accomplish its meaning completely.
