I believe you’re talking about a prepositional phrase. Ex: On the table, in the kitchen.
Answer:He found books at the library
Explanation:
The correctly punctuated sentence is : D. Sparky, you are one sweet puppy
Punctuation is used to determine the flow of the sentence and how the sentence should be read. The best answer is option D. The other options seems to create unecessary delay when we read the sentence
hope this helps