Ariot differs from a mob in that select one:

a. riots are more unified and more focused than are mobs.

b. riots end when the participants exhaust themselves or when officials regain control.

c. riots are more destructive and violent than are mobs.

d. riots attack property, while mobs attack people.

The answer to your question is C.

Sorry but the correct answer is Riots end when the participants exhaust themselves or when officials regain control

Explanation:

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.