To examine one's own thoughts and feelings:

A. Meditation

B. Retrospection

C. Reflection

D. Introspection

Answer: Option D

Solution(By Examveda Team)

The one word substitution is Introspection.

Meditation: attention or heed.
Retrospection: the action of looking back on or reviewing past events or situations, especially those in one's own life.
Reflection : a thing that is a consequence of or arises from something else.
Introspection : the examination or observation of one's own mental and emotional processes.