Answer: B. luc, lum
Luc/lum means light in Latin. This can be seen in words like lucent, illuminate, luminary, lucifugal, luculent, lumen, luminescent, luster, luciform, elucidative, circumlucid, lucid, translucent, luminary, etc. All of these words refer to light and are used in words relating to light. The name “Luca” is derived from the Latin word “Lucas” which means “bringer of light.”