Question

Which sentence contains an adverb clause?

a. Only 1,600 covered bridges exist in the world.
b. If you visit Pennsylvania, take the self-guided, covered-bridge tour.
c. Covered bridges remind us of days gone by.
d. The Lehigh Valley, in eastern Pennsylvania, has seven covered bridges.

Answer 1

I think the answer is D

Answer 2

The sentence that contains an adverb clause is "The Lehigh Valley, in eastern Pennsylvania, has seven covered bridges."

Step-by-step explanation:

An adverb clause works as a regular adverb and they belong to the same categories, the sentence D has an adverb clause with an adverbial of place, this clauses commonly start with a preposition which in this sentence is in, this tell the place where the things happen or where the things are, then this one specifically describes where the Lehigh Valley is.