An Example of a Mechanism in Which Sex Is Determined

An example of a mechanism in which sex is determined by environmental factors is

A) females are produced from fertilized eggs, whereas males are produced from unfertilized eggs.
B) when the male cares for the eggs, all of the offspring will be male, whereas if the female cares for the eggs, all of the offspring will be female.
C) fertilized eggs incubated at one temperature produce males, whereas eggs incubated at a different temperature produce females. 
D) males will have a Y chromosome, whereas females will not have a Y chromosome.