What is the solution for t in the solution?

Iknow #2 is d. i just need to know why

If the concentration of phosphate in the cytosol is 2.0 mm and the concentration of phosphate in the surrounding fluid is 0.1 mm, how could the cell increase the concentration of phosphate in the cytosol? a) passive transportb) diffusionc) active transportd) osmosise) facilitated diffusion

Which three statements represent the benefits of performing experiments using computer simulations?