Answer:
The correct asnwer is b. migration
Step-by-step explanation:
Behavioral adaptation is a type of adaptation which an organism used for its survival. So these adaptations are helpful for organism to take a decision which helpful in the survivability of the organism.
This adaptation comes after a long period of natural selection and evolution. Migration is the behavioral adaptation which allows the birds to migrate from one place to another for the search of food and a suitable environment to live.
Birds often migrate from north to south in winter to find more food which represents their behavioral adaptation for their survival through migration. So the right answer is b. migration.