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This question has bothered a few people, so I want to address a few things. This question is not about your knowledge of Tc, although if you happen to have experience in medical imaging it may seem familiar. The key thing here is extrapolating from the phrase "scintigraphic images" in the passage. A scintillator collects emissions of all sorts and converts them into visible light that we can quantify. That should have been your biggest clue from the passage. Because the passage is about magnetic fields, choices B and C may have caught your attention. However, the role of Tc is to emit a signature frequency so that the concentration and migration rate of the red blood cells to which it is attached can be assessed directly. It is no more than an emitting marker on the red blood cell. It has no charge or magnetic properties of significance here.
