A.
No, it is not reasonable because –5 + –8 = –13.
B.
Yes, it is reasonable because –5 + –8 = +13.
C.
No, it is not reasonable because if you add two numbers you will get a number that is greater than either of the two numbers.
3,000 ÷ 200 = 15
4,000 ÷ 100 = 40
4,000 ÷ 10 = 400
3,000 ÷ 20 = 150