When referring to attenuation in regulation of the trp operon,it would be safe to say that when there are high levels of tryptophan available to the organism,__________.

A)ribosomes are stalling during translation of the attenuator region
B)transcriptional termination is likely
C)translational termination is likely
D)tryptophan is inactivating the repressor protein
E)the trp operon is being transcribed at relatively high levels