Why do phospholipids form a bilayer in water? A.) The phosphate portions repel each other. B.) The hydrophilic and hydrophobic parts attract each other. C.) The phosphate portions attract water, and the lipid portions repel water. D.) The lipid portions attract water, and the phosphate portions repel water.

d. the lipid portion attracts water and the phosphate portion repels water 

The correct answer is C the phosphate attracts water (hydrophilic) and the fatty acid tail or lipid portion repels water (hydrophobic). Just remember that fat and oil don't mix, they repel one another. That is why the tail is "water fearing" or hydrophobic.