What question does the adverb clause answer? I'll meet you because I need to talk to you.

In the given sentence, the adverb clause is "because I need to talk to you". Adverb clause consists of a group of words that modify a noun, adjective and an adverb. It is usually introduced by subordinating conjunctions such as because, if, although, after and such as. The subordinating conjunction in the adverb clause is the word "because". The adverb clause answers the question "why?".