Answer:
A.) ecological isolation
Step-by-step explanation:
A.) is correct because ecological isolation describes how different organisms cannot reproduce with each other as a result of living in different locations/environments.
B.) is incorrect because behavioral isolation describes how organisms cannot reproduce as a result of different mating rituals or other behaviors.
C.) is incorrect because temporal isolation describes how organisms cannot reproduce as a result of engaging in reproductive behaviors during different time periods.
D.) is incorrect because gametic isolation describes how organisms who try to reproduce, cannot, as a result of male and female gametic incompatibility.