In Some Species, Sex Determination Is Influenced by Environmental Temperature

In some species, sex determination is influenced by environmental temperature during development. If you wanted to determine the temperature at which one would obtain a 1:1 sex ratio in a particular species of turtle, which of the following experiments would best address this question?

A) Grow the turtles in two different incubators at temperatures of 22ºC and 30ºC.
B) Grow the turtles in three different incubators at temperatures of 26ºC, 28ºC, and 30ºC.
C) Grow the turtles in four different incubators at temperatures of 24ºC, 26ºC, 28ºC, and 30ºC.
D) Grow the turtles in five different incubators at temperatures of 22ºC, 24ºC, 26ºC, 28ºC, and 30ºC.