Simple chemistry question please help. Look at image.

The answer for #3 is c but i don't 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

The chemical formula for emerald is be3al2(sio3)6.an emerald can be decided as