Can you help cant figure this out what is an ore containing unstable nuclei A gypsum B feldspar C magnetite Pitchblende?

The ore containing unstable nuclei is D) Pitchblende. Pitchblende, also known as uraninite, is a primary ore of uranium and contains radioactive elements with unstable nuclei. Gypsum, feldspar, and magnetite do not contain such unstable nuclei and are not radioactive.