Which word creates the transition between the stated problem and its emerging solution?

who

but

as

this

The answer is: but.

Explanation:

“But” is the appropriate conjunction word that can be used to connect two sentences or groups of words, whereby the first sentence contains the problem, and the second sentence contains the solution. For example, in the statement, “The flood used to devastate the land, but the dam has stopped the flood”, the word "but" was used to join the first sentence (which stated the problem—the devastation of the land by the flood) and the second sentence (which stated the solution—the dam).

because girls easily trust boy