Fidan Is Studying a Model of Obesity

Fidan is studying a model of obesity. For her experiment, Fidan uses three groups of 31 rats each that are given either (1) 24-hour access to high calorie treat food in addition to their normal chow, (2) restricted 8-hour access to high calorie treat food and 24-hour access to their normal chow, or (3) 24-hour access to only their normal chow. Every day, Fidan weighs the animals and carefully takes note of the amount and type of food each animal has consumed. At the end of the experiment, Fidan performs surgery on all the animals and notices that the animals that put on the most weight showed noticeable differences in their hypothalamus compared to the rest of the rats.
-Which of the following is a hypothesis for Fidan's experiment

A) If rats are given more access to high calorie treat food they will put on more weight.
B) More access to cafeteria style food causes rats to put on more weight.
C) There is a correlation between how much access a rat is given to high calorie treat food and their weight.
D) The hypothalamus of rats is associated with the consumption of high calorie treat food.