When Warnecke and colleagues were looking for genes that are involved in the digestion of lignocellulose by termites, they needed genes_______ .

A) expressed when a termite is eating
B) for the bacterial enzymes found in the lignocellulose- digesting part of the gut
C) of the termites' mitochondria
D) from the sequences of the termite genome
E) genes found in cells of the termites mouth