I would say A is the correct answer. B and C are definitely wrong, and I think D is talking about genes and not chromosomes.
Answer:
Whereas weather refers to short-term changes in the atmosphere, climate describes what the weather is like over a long period of time in a specific area. ... Looking at Climate Normals can help us describe whether the summers are hot and humid and whether the winters are cold and snowy at a particular place.
I believe the answer is Density have a very nice day