I think its A. Hope it's the correct answer
Your answer is A I remeberthis story quite well. :)
The correct answer to this very question today is
>-------(sequential organization)<-------
Evolution and variety are the outcome of long-term interactions between organisms and their surroundings, as well as the repercussions of those interactions. Species adapt to their habitats through time, and the range of environments available encourages a diversity of organisms that have adapted to them.