Does Air Conditioning Lead to Obesity? Which of These May

Does air conditioning lead to obesity? Which of these may not be a valid argument?

A) Keeping home, vehicle and workplace at one temperature all year round promotes body fat
B) Thermal neutrality can only maintain the obesity status quo
C) Cool air temperature encourages fat burning
D) Warm air temperature decreases natural appetite
E) Natural body temperature regulation from variable air temperature is a good thing