Anyone know the answer to this? if u get it right i’ll mark brainliest

A

Explanation:

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During a chemical reaction, the total mass of material does not change

Explanation:

First, a hypothesis is not a question, so the second option is wrong. A hypothesis is a statement that uses evidence to create a conclusion. The third option states their opinion without anything to back it up. The last option is also their opinion. The first option says during, as if it's already been tested. So, it's safe to assume this statement has already been tested because they already came to a conclusion, which is the total mass of material does not change.

b

explanation:

the american revolution was by the middle and upper class, and the french was by the lower and middle class.