Answer:
Hello. None of the answer options is correct, as the new arrivals delay adaptation to new food plants.
Step-by-step explanation:
The arrival of new birds increases competition for food. This makes the birds that have just arrived have some difficulty in accessing food, as they will have to compete with the birds that are already on the island. This makes the novice birds look for food plants they already know, which delays their adaptation to feeding new plants they do not know.