Out of all the alternatives given, select the word which closely fits the given idiom/phrase.
Barking up the wrong tree

Correct option is B

Option (b) is the correct meaning of the given idiom.
Given Idiom: Barking up the wrong tree
Meaning: To pursue a mistaken or misguided course of action. (गलत दिशा में कोशिश करना)
Example:
If you think I’m the one who leaked the news, you're barking up the wrong tree.
Other related idioms and their meanings:
Jumping to conclusions – To decide something without all the facts.
Off the mark – Not correct or accurate.
Go off on a tangent – To suddenly start talking about a different topic.