Garner Pharmaceuticals is a U.S. drug company that manufactures eye medications. Based on research conducted at the SASB, one of the following sustainability topics is substantially more likely to be highly material for Garner than the others. Use your knowledge of the pharmaceutical industry to identify this topic. 

a. Fuel management and transportation

b. Child and forced labor

c. Air pollution

d. Product quality and safety

e. Biodiversity impacts