what solution works best for recovering undistorted prtozoan cysts and nematode larvae from fecal samples?

Question

need it for my college test............heres the choices i have
glucose, sodium chloride, sodium sulfate, zinc sulfate

Answer 1

I am just guessing here, but here's the logic: need sodium chloride to make sure there is an osmotic balance in the solution and the organism; and glucose to increase the density of the solution so the organisms float to the top. I have no idea if this is correct.