The food-scarce environment of our ancestors likely led to humans' propensity to gorge when food is available and to crave high-caloric foods—a trait that might lead to an epidemic of obesity when food is plentiful. this illustrates how:

This setting will no longer happen for people nowadays are much conscious with their health and that people would not think of food scarcity, for all types of food are made available and that various fitness gym are everywhere. Being obese is lack of self-control and eating healthy diet is always choice. Therefore, evolve mechanisms are not always adaptive in modern society.

Hmm this is a hard heterotroph's can't produce its own food. a human can produce it's own food because people kill animals and eat them like squirrel, deer, oak trees need rain which they don't produce the rain, bee's need flowers and pollen and nectar but they don't produce it either, rabbit's don't produce either, because they either steal carrots from your garden and eat leaves.so, the best answer that i would pick is a. humanshope my answer has you and sorry if it doesn't : ) : (