Why do lysosomes keep their digestive enzymes in membranous sacs?

A. because the membranous sacs can sense when the cell is about
to be attacked

B. because the membranous sacs keep the digestive enzymes
from destroying the cell

C. because the membranous sacs act as tails that help the
lysosomes move faster

D. because the membranous sacs act as factories helping the
digestive enzymes make proteins