Agraph titled "average hamster weight (kg) vs. amount of drug (mg/day)"
shows a downward-sloping line that reaches a minimum value and then stays there over the remainder of the graph.

what noticeable trend from this graph might be used to make a conclusion?
a. average hamster weight is not affected by the daily amount of a drug.
b. average hamster weight causes the amount of drug to increase daily.
c. average hamster weight doubles every time the daily amount of a drug is doubled until all of the drug has been used up.
d. average hamster weight decreases with an increase in the daily amount of a drug until the hamsters reach a minimum possible weight.