Correct Answer - B
LCM of 3,2 and 4 =12
The ratio of number of chocolates distributed to A,B and C
`1/3 : 1/2 : 3/4 = 1/3 xx 12 : 1/2 xx 12 : 3/4 xx 1`
= 4:6:9
The number of chocolates received by
` C= 9/((4+6+9)) xx 57 9/18 xx 57 = 27`
Hence, the correct option is (b).