Which of these is responsible for evolutionary changes in a species? A. Using or failing to use part of the body increases or decreases its size for the next generation. B. A gene that has long-term...

Which of these is responsible for evolutionary changes in a species?
A. Using or failing to use part of the body increases or decreases its size for the next generation.
B. A gene that has long-term benefits to the species will become more common.
C. Individuals with certain genes reproduce more than average.
D. Evolutionary changes anticipate the adaptations that will be advantageous in the future.