Which of the Following Demonstrates a Focus on Solving Problems,not

Which of the following demonstrates a focus on solving problems,not controlling others?

A) "You need to take on more responsibility next year."
B) "Why didn't you report your error to accounting sooner?"
C) "So, how are you going to get yourself out of this mess you've made?"
D) "Our "rejected products" count has increased by 10% in the past month. Can you suggest any remedies?"