What type of drug test measures the amount of a drug in the specimen? quantitative or qualitative

The correct answer is: [A]: "quantitative".

{since this refers to a "quantity" ; that is, an amount that can measured.}.

{as opposed to something that is "qualitative" ; such as the "mere presence or absence of a drug, color, repeated change in a color; to cite some examples.}.

b i think it’s a water wheel turning in a stream