Which of the following contains a pronoun error? (Points : 2)

Neither Jane Austen nor Mary Shelley is known for their poetry.
As the curtain rises, everyone in the audience settles into his or her seat and waits for the play to begin.
The book sale that is held in the spring is an important fund-raiser for the library.
Investors who do their homework may see an increase in their dividends.

Do you see the error in this sentence?

Neither Jane Austen nor Mary Shelley is known for their poetry.