challenge: According to Gregory and Thompson (1977), what is the nature of the distribution of Coma I group members around NGC 4274?
  
  A. A slight density enhancement around NGC 4274 with the rest of the members uniformly distributed to the southeast
  B. A uniform distribution with no density enhancements
  C. Two distinct subgroups centered on NGC 4274 and NGC 4565
  D. A random distribution with no central structure
  Answer: 