Answer:
Adverb clause.
Step-by-step explanation:
An adverb clause is a dependent clause that modifies the verb or acts as an adverb in the sentence. It will contain a verb and a subject that uses subordinating conjunctions to connect to the main clause.
In the given sentence, "Most flowering plants will grow where there is a lot of sunlight", the phrase "where there is a lot of sunlight" is an adverbial clause.
This is because, first, it uses the subordinating conjunction "where" to link the sentences. And second, it modifies the verb "grow", providing the answer for the "where" part of the sentence.
Thus, the correct answer is the adverb clause.