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In the list of whole numbers from 0 to 9, there are 10 values
{0,1,2,3,4
 5,6,7,8,9}

I wrote the list into two parts: the first part from 0 to 4 which consists of 5 values; the second part from 5 to 9 which is the next five values

80% of 10 is 8 since 
80% = 0.8 and 0.8*10 = 8
We can think of it as 80% =80/100 = 8/10

So the first 8 values of the list mentioned above can represent a success. Those 8 values are: 0,1,2,3,  4,5,6,7



Choice B) 0,1,2,3,4,5,6,7