Which word is used incorrectly in the text?
My sister Lakisha just won a contest at school. The contest was to see
which student could read the most books in a month. Lakisha, who's
favorite books are adventure stories, read more than 20 books! In her
class, they're all calling her "Speed Reader" now. She's very proud
because it's a big deal to win.
A. it's
B. who's
C. they're
D. won