Which sentence contains an antecedent that is unclear, missing, or confusing? a. my sister and i have been taking cooking classes, but she's a much better chef than i am. b. during the announcements this morning, they said that football practice was canceled. c. in the note left on the counter, my mother said she wouldn't be home until later. d. if you want to go to garage sales with rachel on saturday, she leaves at 7 a. m.