Simplify the Expression $y^{2 / 9}\left(y^{5 / 9}-6 y^{4 / 9}\right)$

Multiple Choice

Simplify the expression. Write answer with positive exponents. Variables are positive real numbers.
- $y^{2 / 9}\left(y^{5 / 9}-6 y^{4 / 9}\right)$

A) $y^{2 / 5}-6 y^{1 / 2}$
B) $y^{7 / 9}-6 y^{2 / 3}$
C) $y^{-1 / 3}-6 y^{-2 / 9}$
D) $y^{10 / 81}-6 y^{8 / 81}$