Imagine a Cell Needing an Essential Specific Amino Acid (One

Imagine a cell needing an essential specific amino acid (one the cell cannot synthesize) .What process could acquire the amino acid most quickly?

A) Phagocytize and digest bacteria, extract the specific amino acid from the residue, and release to the cytoplasm.
B) Place a transporter protein in the membrane that could carry the amino acid across the membrane.
C) Use receptor-mediated endocytosis.
D) Use simple diffusion because the concentration of the needed amino acid will be zero and the gradient will always be maximized.