Final answer:
The dog was too old to play roughly with the kids, it was not too old to enjoy running around the neighborhood.
Step-by-step explanation:
The subject of this question is English and the grade level is Middle School.
The sentence is stating that the dog was too old to play roughly with the kids. It was also too old to enjoy running around the neighborhood. The correct answer is A. kids, it was not.
This sentence uses parallel structure, as both clauses are describing the same thing - the dog's inability to engage in certain activities due to its old age.