Which example does not involve knowledge of chemistry? a. a firefighter working to put out a fire b. a photographer developing color film c. an astronomer identifying the stars of a constellation d. a medical student learning how drugs work

I would honestly say C. All others have ingredients in them that makes them work, the combination of stuff to put out the fire, film is made from a certain material and drugs are an ovbious mixture. Looking at the stars is the only thing you don't need chemistry for.