Barking up the wrong tree

Do you know the English expression “barking up the wrong tree“? Read the conversation below. Can you guess the meaning?

Lisa: I think Irene stole the money from the staff room. She looked guilty when the boss spoke to us about it before.

Angela: I think you are barking up the wrong tree. Irene wasn’t even in work on the day it was stolen.

Does it mean:

a) to complain too loudly

b) to be joking

c) to be mistaken

d) to accuse someone of something

The answer is below! ↓

 

Answer: c) to be mistaken