What does the verb 'ascertain' mean?

The verb 'ascertain' means to find out or to determine something with certainty. When someone ascertains a fact, they are actively seeking information and verifying its accuracy. This process often involves inquiry, investigation, or thorough examination. The meaning aligns precisely with the answer given, which emphasizes the action of discovering or understanding information clearly. The other options present different actions or concepts that do not relate to the process of discovery or verification inherent in 'ascertain.'