Answer:
d. with puppy-dog eyes
Explanation:
The following misplaced group of words or modifiers are "with puppy-dog eyes", and when re-written it should look like this, "Having been discovered, with puppy-dog eyes Rover looked up at his owner"
The sentence is an example of a cause and effect reasoning. It helps to stablish the relationship between an event that comes first, and the one that takes place after the former. This type of reasoning provides the necessary information and details to understand why certain events happens as they do.
Could you please add the excerpt?