UGC NET Statistics Q14

Question

Arrange the data sets with following means ($\bar{x}$) and standard deviations ($\sigma$) in increasing order of their coefficients of variation:
(A) $\sigma= 3.7, \bar{x} = 20$
(B) $\sigma= 4.3, \bar{x} = 25$
(C) $\sigma= 5.2, \bar{x} = 35$
(D) $\sigma= 6.1, \bar{x} = 40$
Choose the correct answer from the options given below :