A few of these answers could work but I think A or C would be most fitting!
The correct answer should be additionally.
The word additionally would provide the best transition between these two sentence. It is so because you have one idea in the first sentence, and then you want to show another idea very similar to the first one in the second sentence. Using additionally to convey that is the way to go.
To me the answer is B because that one doesn't really sound right compared to the other answers.
Answer:
It allows for a stronger friendship to grow between police and Fletchers that teaches her a lesson about responsibility
Explanation: