Which of the following best summarizes why the family was having mouse trouble

The family is having mouse problems probably because their house provides  food for them. so I'd suggest putting the food in plastic tupperware and containers.

:)  

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.