Answer:

The answer for this is :

C. 20%

Step-by-step explanation:

It is because 20÷ 25 = 0.8 and if you turn it into percentage then it will become 80%

However, the problem asks the percentage of the game they lost, then 100 - 80 = 20

C. 20%

25(x%) = 5 === 5 is from the 25-20 = 5

25(x/100) = 5

x/4 = 5

x = 20