The following are sample test scores out of $100$ for two different classes. Calculate the coefficient of variation for each class and determine which class has more relative variation.
Class A: $72$, $75$, $78$, $80$, $85$
Class B: $68$, $70$, $75$, $80$, $87$

Class A: $10.15\%$

Class B: $6.35\%$

Class A has a higher CV than Class B.

Class A: $6.35\%$

Class B: $10.15\%$

Class B has a higher CV than Class A.

Class A: $5.68\%$

Class B: $5.68\%$

Both classes have the same CV.

The CV cannot be determined from the given data.