Why there is alot of fractions that are equivalent to 4/5 ?

When you have a fraction, you can make it into as many equivalent fractions as you want, there is an infinite number of possibilities. As long as you multiply both the numerator and the denominator by the same number, the fraction will be equivalent. For example. If you multiply it by 2, you'd get 8/10. By three would be 12/15. By 4 would be 16/20 and so on and so forth. Hope this helped!

It would have to be c or d