The Primary Difference Between Entering into a Gamble and Purchasing

The primary difference between entering into a gamble and purchasing insurance is that

A) in a gamble the odds are known with certainty.
B) with all types of insurance you are always financially better off,whereas,with gambles,you are always financially worse off.
C) a gamble involves pure risk,whereas insurance involves speculative risk.
D) gambling is in many circumstances illegal and insurance is legal.