challenge: According to studies, which demographic group has the highest prevalence of indoor tanning?
  
  A. White males, 26-35 years old, with high skin sensitivity
  B. White males, 16-25 years old, with low skin sensitivity
  C. Non-white females, 36-45 years old, with high skin sensitivity
  D. White females, 16-25 years old, with low-to-moderate skin sensitivity
  Answer: 