What correction would you make to fix the punctuation error in the following sentence?

Leeann studied all weekend; therefore: she did well on her algebra test.
A) Replace the colon after “therefore” with a comma.
B) Replace the semicolon after “weekend” with a comma.
C) Replace the semicolon after “weekend” with a colon.
D) Replace the colon after “therefore” with a semicolon.