If A=2/3B,B=2/3C,and C=2/3D,what part of D is B?

a. 8/27
b. 4/9
c. 2/3
d. 75
e. 4/3

please answer and explain

you want B/D

B/D = (2/3 C)/D
= (2/3 (2/3 D))/D
= 4/9

A is just noise.