Two host races of apple maggots have appeared within the past 100 years. This suggests that they may ...

Two host races of apple maggots have appeared within the past 100 years. This suggests that they may
  be undergoing
 
  a. parapatric speciation.
  b. allopatric speciation.
  c. sympatric speciation.
  d. genetic drift.
  e. development of a hybrid zone.

Question 2

A host race develops when an organism's
 
  a. genes for the host plant choice change.
  b. genes for mating preferences change.
  c. geographical barriers exist.
  d. genes for the host plant choice change and genes for mating preferences change.
  e. genes for mating preferences change and geographical barriers exist.