Question

which image shows results from a multidrug screen showing the level of the drug or its metabolites are below the cutoff level?

Explanation:

In a drug - screen, a negative result (drug or its metabolites below the cutoff level) is typically indicated by the presence of only the control line (C). The test line (T) absence suggests no drug or metabolite above the cutoff. The third image with only the C line present shows a negative result.

Answer:

The third image (the one with only the C line and no T line).