If $$\frac{A}4= \frac{B}5=\frac{C}6$$​, then A : B : C is:

Correct option is A

Given:

$$\frac {A}{4} = \frac {B}{5} = \frac {C}{6}$$​

Solution:
Normalize using the common denominator.
Let $$\frac {A}{4} = \frac {B}{5} = \frac {C}{6} = k$$​ 

​$$A = 4k, B = 5k, C = 6k$$​​

​$$(A : B : C) = (4 : 5 : 6)$$​​