A Laboratory Is Testing the Relative Safety of a Drug

A laboratory is testing the relative safety of a drug, producing a ratio that is very close to 1. This calculation suggests that:

A) the safe, careful balance between lethal dose and effective dose has been achieved, although, of course, the safety margin is very narrow.
B) the laboratory has determined the dose at which the drug is lethal to the minimum number of people.
C) the drug is very dangerous; this dose would be required to attempt to effectively cure the patient, but it could also kill him or her.
D) this drug may have alterations in half-life of elimination when dosage overwhelms the biologic capacity for megabolism.
E) none of the above is correct.