Answer:
Option B i.e., Add a Visualforce page to the Case layout is the correct option.
Explanation:
In the above statement, Customer care agents are disappointed by how they deal with their existing case of management solution and they have requested a far more simplified manner of handling and viewing situations.
So, they decided to add a page of the visualforce to the case layout by which they can maintain their productivity and provide the following services to their customers through agents.