Answer asap! answer must include an explanation in order to receive points and the brainliest answer. you.

C, because 36 is just under half of 80, so it is 9/20. 

Okay, So Here We Are With Another Problem. Lets Attack It Right Away!
So, Here Are Some Important Things. 
Section One Was Done 20 Times
Section Two Was Done 36 Times
Section Three Was Done 24 Times. 
So, Lets Use This Info.
We Must First Add All Of The Values.
20+36 = 56+24 = 80. 
Now, Make It A Fraction.
36/80 Chance.
Now, All We Must Do Is Simplify. 
36/2 = 18. 80/2 = 40.
18/40. Simplify More.
18/2 = 9. 40/2 = 20.
So, The Simplified Fraction Is 9/20. 
So, Your Grand Answer Is C. :D

The answer might be a

The answer is 30 minutes to an hour