6221. He was a contemplative person.

✅ The correct answer is option A.
Thoughtful : absorbed in or involving thought.

Careless : not giving sufficient attention or thought to avoiding harm or errors.

Over-zealous : too zealous in one’s attitude or behaviour.

Mischievous : causing or showing a fondness for causing trouble in a playful way.

Contemplative : expressing or involving prolonged thought.

Synonym of Contemplative is Thoughtful