Correct Option: B

Given that,
⁶√0.000729
first method to solve the equation.
after removing the decimal, the equation will be
= ⁶√729/1000000
Simplify the equation.
= ⁶√3 x 3 x 3 x 3 x 3 x 3 / 10 x 10 x 10 x 10 x 10 x 10
= ⁶√3⁶/10⁶
= ⁶√( 3/10 )⁶
After simplifying the root we will get,
= ( 3/10 )^{6 x 1/6}
= 3/10
= 0.3


Second method to solve the equation.
simplify the the number in multiplication of numbers.
⁶√0.000729
⁶√0.3 x 0.3 x 0.3 x 0.3 x 0.3 x 0.3
= ⁶√(0.3)⁶
remove the root and simplify ,
= (0.3)^{6 x 1/6}
= 0.3