Answer:
The correct answer option is D) x to the 1 third power.
Explanation:
Firstly, we will translate the given word expression (open parentheses x to the 2 fifths power close parentheses to the 5 sixths power) into mathematical expression:

Now to simplify this, we must recall the law of multiplying the powers:

So for the given expression, we will multiply the powers to get:
=

=

=

Therefore, the correct answer option is D) x to the 1 third power.