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.

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

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.

b) sending meeting reports

hope this

if you want you can give me brainiliest i need 3 more but your choice

                  ~jayden

the main character of "the secret life of walter mitty" retreats into a false pretense as a means escape from his mundane reality -- this is a flagrant issue seen in societies abroad, typically found in young adults and it is robbing our youths of their childhood.

explanation:

a thesis -- a well developed, formal thesis is required to be one sentence long. there are many themes in "the secret life of walter mitty" and i had resolved to give you one of the simpler ones while still honing it with class.