Which of the following represents 4 x to the 5 sixths power in radical form? sixth root of 4 x to the fifth power 4 times the sixth root of x to the fifth power fifth power of 4 x to the sixth power 4 times the fifth power of x to the sixth power

For this case, the first thing we must do is write the expression algebraically.
 "4x to the 5 sixths power"
 We have then:
 
 We write the expression now in its equivalent radical form.
 We must bear in mind that in the power 1/6, the number 6 is the index of the radicand.
 We have then:
 
 
 sixth root of 4 x to the fifth power

Iam thinking the answer is a.) knew