Square Root equivilant expersions?

I am preparing to take a placement test tomarrow for school, and am doing some sample questions for the test, and i totally cant remember how to do this among other things so i am sure you will hear from me quite a bit in the coming hours.

For positive real numbers x, y, and z, which of the following expressions is equivalent to x^(1/2)y^(2/3)z^(5/6) ?

A. 3sqrt( xy2z3)

B. 6sqrt( xy2z5)

C. 6 sqrt( x3y2z5)

D. 6 sqrt( x3y4z5)

E. 11 sqrt( xy2z5)

i am really looking for a guide/explanation and a soultion.