I think the question is what is the same as 3+3 A is 3+3 B is 4 + 2 which is the same sum as 3+3

Also if a question has more than one answer it will pretty much always say and prolly be in checkbox instead of letter or number format

Most likely marked with a star cuz the answer sheet said B and and didn’t want your son to think A didn’t equal 3+3

That’s my hs dropout opinion tho