The right options are; radium and polonium
The two elements isolated by the Curies are; radium and polonium.
Marie and Pierre Curie discovered the existence of the elements radium and polonium when they conducted pioneering research on radioactivity. They successfully removed radioactive radium salts from the mineral pitchblende in their laboratory. Marie Curie also discovered that the potential to emit radiation does not rely on the structural arrangement of the atoms in a molecule.