Which one if the following are appropriate units for measuring volume

Volume is expressed in "cubic" as prefix of the material being measured. 

In cement, it would be measured in cubic yards 
In liquids in can be liters, gallons, ounces etc.. 
That's my answer off the top 
Norm 

In SI, you use litres and derivatives (such as ml, kl, etc.) 
In Imperial and US, the units are ounces, cups, pints, quarts, and gallons.

The answers is a nuclear changes

B. nuclear reactions could first occur.