Eric is proofreading his narrative about teaching his children how to fish. He finds an error in the following passage:

I plan to drink a cup of coffee and enjoy the peaceful lake, but I am soon untangling fishing line instead, Emma gets hers caught in a tree and then in another tree. Charlie has some success with casting, but then he gets his line tangled in the ground and is sure he has caught a gopher.

Which correction should Eric make to fix the error?

a.)
He should replace the comma before "Emma" with a period.
b.)
He should change "hers" to "her's."
c.)
He should change "has caught" to "had caught" in the last sentence.
d.)
He should remove the comma before "but" in the first sentence.