Select the most appropriate option to fill in the blank and make a grammatically correct sentence.

It wasn’t easy, but finally we succeeded ________ finding a solution to the problem.

in

The most appropriate option to fill in the blank is in.

• In means inside of something. It is the most appropriate word because it accurately describes the location of the solution to the problem. The solution was found inside of the problem.
• Of means belonging to or connected with something. It does not make sense in the context of the sentence, because the solution is not connected to the problem.
• At means near or next to something. It does not make sense in the context of the sentence, because the solution is not near or next to the problem.
• For means intended for someone or something. It does not make sense in the context of the sentence, because the solution is not intended for someone or something.