Controlling the Production of a Pigment Is Interesting, but in Itself

Multiple Choice

Controlling the production of a pigment is interesting, but in itself seems more a stunt than a valuable research endeavor. What is the broader significance of the results of Cronin et al.?

A) This same genetic system potentially can be used to control the expression of genes involved in weight control.
B) The same genetic system can be used to create black as well as brown mice.
C) This same genetic system potentially can be used to control the expression of almost any gene.
D) This same genetic system potentially can be used to treat hair loss in mice and humans.