Correct option is C
Option (c) is the correct meaning of the given idiom.
Idiom:
Take it with a grain of salt – It means to doubt the accuracy or truth of something, or not to take it too seriously. (थोड़ा संदेह के साथ स्वीकार करना)
Example:
I take whatever he says with a grain of salt — he often exaggerates.
Other related idioms and their meanings:
Pull the wool over someone’s eyes – To deceive someone
Cry wolf – To raise a false alarm
Bite your tongue – To stop yourself from saying something