Which Situation Can Be Considered an Example of an Abiotic

Which situation can be considered an example of an abiotic factor acting as an agent of natural selection?

A) A viral disease wiped out most of a mouse population, but those who survived were immune to the virus.
B) Lighter-colored moths on tree trunks were more visible to predators and were more likely to be preyed upon.
C) Polar bears with genes for thicker coats were more able to survive intensely cold temperatures, and more of their offspring survived.
D) As water temperatures changed along a north-south gradient, fish populations of the same species produced different amounts of antifreeze-like chemicals.
E) A new grasshopper species invaded a prairie habitat and quickly stripped the nongrassy perennial plants; animals dependent on these plants moved or died out.