6340. He couldn’t comprehend the details of the document.

✅ The correct answer is option B.
Emphasise : give special importance or value to (something) in speaking or writing.

Grasp : comprehend fully.

Condense : make (something) denser or more concentrated.

Implement : put (a decision, plan, agreement, etc.) into effect.

Comprehend : grasp mentally; understand.

Synonym of Comprehend is Grasp