Read the Following Scenario, and Answer the Questions Below

Multiple Choice

Read the following scenario, and answer the questions below.

Pablo and Johanna have to do a yearlong study for their biology course. After some discussion, they decide to propose comparing their dogs and the diet that they feed them to test their hypothesis that the local veterinarian's special dog food mix will enhance growth and development. Each student will adopt a puppy from the local pound. Pablo will feed his shepherd- mix dog the special diet of wet and dry foods from the local vet, while Johanna will use generic dry kibble from the supermarket for her bulldog.

-The independent variable in this study is_________ .

A) the age of the dogs
B) the breed of the dogs
C) the type of food the dogs receive
D) how much the dogs grow