You have isolated 15 mutant bacteria unable to use maltose.All 15 mutations map in the same region.You have tested the mutant for two enzymes in maltose metabolism and find at least one of the mutants lacks one of the enzymes,other mutants lack the other.What does this suggest?

A) There are lots of enzymes in maltose metabolism.
B) All the genes for maltose metabolism are in a cluster and could be one operon.
C) There are genes scattered all over,we've simply found one set of mutants.
D) Maltose transport is very complex,these are transport mutants.
E) None of the choices are correct.