Answer:
The answer to your problem is, C. The mass of a basketball
Explanation:
First of all, if you want to measure heavy items then you could do it in kilograms for example:
Cup filled with water ( lb )
Gallon tank ( kg )
Since basketball or heavy ( depends how much pressure is put it there ) and you cannot really " weigh " a river.
The heaviest option from the option choices A, B, & C.
Option C, is the heaviest
Thus the answer to your problem is, C. The mass of a basketball