The weights of 3 boxes are 4, 7 and 10 kilograms. Which of the following CANNOT be the total weight, in kilograms, of any combination of these boxes?

The weights of 3 boxes are 4, 7 and 10 kilograms. Which of the followi

1.	The weights of 3 boxes are 4, 7 and 10 kilograms. Which of the following CANNOT be the total weight, in kilograms, of any combination of these boxes?
A.	14
B.	21
C.	17
D.	18
Answer» E.