In Many Organelles, Groups of Different Enzymes Are Located on Membranes

In many organelles, groups of different enzymes are located on membranes in close proximity to each other because

A) attaching enzymes to the membrane prevents the cell from losing them to the surrounding environment.
B) when enzymes are in close proximity, each one can catalyze more than one type of reaction.
C) these enzymes are involved in the same metabolic pathway and keeping them closer together increases the efficiency of the pathway.
D) all enzymes must act in groups to sufficiently reduce the amount of activation energy required for a reaction to occur.