I am fairly sure that the question is asking which is more than 23? I'll just explain them all anyway. A is 5 plus 6.5, or 11.5. B is 55, which is also more than 23, but still going. C is 25. D is 17.
1 foot = 12 inches, so now you add 3 inches until you get 12. you add 3, 4 times toget 12. 3+3=6+3=9+3=12 and do that again for the 2nd foot 3+3=6+3=9+3=12 you added 3, 4 times to get 12 twice so now add 4+4=8 YOUR ANSWER IS 8
