12 lb 8 oz + 17 lb 8 oz

A-30 lb

B-29 1/2 lb

C-29 lb

So what you do is you first add the 12 and 17 and end with 29 pounds. 16 ounces make a pound, so since 8+8 is 16 that then makes it one pound. add those two together and you end up with 30. so the answer is A