Read the sentence.

After spending years of time conducting research to look for information, the scientist finally made a discovery that would solve a problem once and for all.

Which revision most effectively shortens the sentence to make it less repetitive and more precise?

Drag the revision into the box.

A) After years of research, the scientist discovered a cure for the rare disease.

B) The scientist spent a long time looking for research information and made an important discovery.

C) The scientist conducted research to find information and discovered a solution to a problem he wanted to solve.