A. dog
It's the only one that renames the subject, which is Brutus
In an essay it should only be one I'm pretty sure, but in a narrative as many as it takes to explain a lesson learned. If you were writing a book your conclusion would be whatever comes to you and whatever you feel the characters would do/say/feel.
The answer is A, it contains a fragment
Hope this helps!
Answer: Being generous is so important because it will come back to you later on in life. If you're mean to someone that might come back to you negatively.
Answer:
a. on
b. I don't think here a preposition is needed as "This is the key to my room" is a complete sentence.
c. in
d with
Hope it helps!!
Have a nice day:)