Which of these sentences contains an adverbial clause?

AHe told me where I could get some coffee.
BWhat she pointed out is very significant in these times.
CI do not know how to invest my money.
DMost animals thrive where they can find food easily.

Verified Answer :

Only one of the sentences contain an adverbial clause. I lay out the explanations below.

(A) NO ADVERBIAL CLAUSE. "Where I could get some coffee" is part of a reported speech.
(B) NO ADVERBIAL CLAUSE. "What she pointed out" is a noun clause.
(C) NO ADVERBIAL CLAUSE. "How to invest my money" is the direct object of know; hence, it's a noun clause.

(D) "Where they can find food easily" is an example of an adverbial clause. It is an adverb of place, answering the question: Where do most animals thrive?