Correct Answer: C
Explanation:
It is evident that the missing word explains the type of meditation that acquires its meaning by relating to man’s existence. This implies that the missing word cannot be something that means meaningless. Therefore, the words vague and futile do not fit in the sentence. Profound and philosophical are synonyms and they complete the meaning of the sentence as a whole when either of them is placed in the blank and hence, C and D are the correct answers.