How can a scientist assess whether a pure niobium Nb sample is responsible for contaminating the lab with radioactivity?
A
Place the niobium under pressure, and see if the level of radioactivity in the lab increases.B
Heat the niobium, and see if the level of radioactivity in the lab increases.C
Test the niobium sample for the presence of niobium oxide compounds.D
Test the niobium sample to see whether it now contains other elements.