Enzymatic Reactions Can Become Saturated as Substrate Concentration Increases Because

Enzymatic reactions can become saturated as substrate concentration increases because

A) enzymes have the highest possible number of hydrogen atoms attached to them.
B) the concentration of substrate reaches a point at which it cannot increase any further.
C) substrates are inhibitors of enzymes at high concentrations.
D) the activation energy of the reaction reaches a point at which it cannot be lowered further.
E) a limited number of enzyme molecules are present.