challenge: What are the primary focus areas of the Harold K.L. Castle Foundation's grant awards?
  
  A. Closing achievement gaps in public education, restoring nearshore marine ecosystems, and strengthening Windward Oahu communities
  B. Funding medical research, improving public transportation, and enhancing community safety
  C. Supporting arts education in Hawaii, preserving historical sites, and promoting sustainable agriculture
  D. Providing disaster relief, promoting environmental conservation, and supporting small businesses
  Answer: 