Which of the following contains a vague pronoun reference?
A. According to Beth, Willie Mays hit 660 career home runs, although Joe DiMaggio had a higher batting average. She said that he is her favorite player.
B. According to Beth, Willie Mays hit 660 career home runs, although Joe DiMaggio had a higher batting average. She said that Mays is her favorite player.
From the given choices, pick the correct answer and respond by indicating the letter of the correct option.

A