Lasting only for a very short time:

A. Transparent

B. Temporal

C. Temporary

D. Temperate

Answer: Option C

Solution(By Examveda Team)

The one word substitution is Temporary.

Transparent : easy to perceive or detect.
Temporal : relating to worldly as opposed to spiritual affairs; secular.
Temperate : showing moderation or self-restraint.
Temporary : Lasting only for a very short time.