【单选题】A dog enthusiast took home two puppies from the dog shelter. He fed one of the puppies super-premium canned dog food, while he fed the other a generic brand from the grocery store. The dog fed on the ...
A.
A dog will sometimes gain more weight when eating inferior-quality food because he must eat more of it to obtain the nutrients he needs.
B.
The dogs were of mixed breeds and appeared to be descended from dogs of different sizes.
C.
Both dogs ate all of the food given to them at each serving.
D.
The dog enthusiast did not give the two dogs equal amounts of their respective foods.
E.
The dog who received the super-premium dog food suffered from a digestive system disorder that hindered his growth.