Plzzz helppppp!!!!!!!! 20+PTS and brainliest!!!!!!!

1.) If I knew ____ vandalized my garage, I would know to ___ I should send the repair bill.
A. whom, who
B. who, whom
C. whom, whom
D. who, who

2.) I’m not sure to ___ I am supposed to send my complaint.
A. who
B. whom