How should this sentence be changed? My jeans were hanging on the clothesline, and a wren tried to build a nest in them.?

How should this sentence be changed?
My jeans were hanging on the clothesline, and a wren tried to build a nest in them.
Question 6 options:
a)
Replace and with therefore
b)
No change needs to be made to this sentence.
c)
Delete the word and
d)
Change the comma to a semicolon

Lord Bacon2021-03-31T11:13:28Z

None of those suggested answers is correct.
To make the sentence grammatically correct, it is only necessary to delete the comma.