You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

A research scientist repeatedly observes a bird avoiding a specific butterfly species even though it eats other types of butterflies. Which statement most likely explains the behavior of the bird?
(A) The behavior is a random act. (B) The behavior is the result of a genetic mutation. (C) The behavior is inherited from the bird's parents. (D) The behavior is learned over the lifetime of the bird.
D