The correct answer is option A Tom Robinson is the character that is most like mockingbird in a metaphorical sense. This is because he has no evil intention towards anyone and has not done anything wrong. All he does is to lend a helping hand to people he encounters.
He also got in trouble trying to help someone. Tom Robinson was helping Mayella with some chores. He was charitable. He was in no way harming anyone. Bob Ewell came home and accused Tom of raping his daughter. Tom was assumed guilty by the community and was killed based on false accusations.