The correct answer is:
The writer contrasts the idea that puppies are a lot of work with the idea that dogs are great companions for life.
This response is accurate because the paragraph highlights the challenges of raising a puppy (training and attention) and contrasts that with the long-term benefit and joy of having a dog as a companion. The use of "Nevertheless" indicates a shift from the burdensome aspects of puppy care to the rewarding nature of companionship, presenting a clear distinction between the two ideas.