I think answer is D because the buses are running at a loss because the number of passengers reduced. Only D resolves this problem. Is this correct reasoning?

the answer is B

A private bus company wanted to increase profits. For twenty years it worked to make its buses more economical and faster by reducing the number of bus stops. Although the company was in some measure successful, the economy grew worse, and the industry almost went bankrupt. Assumptions and realities were vastly different. The real problem came not from passengers who wanted faster transport but from the number of passengers who stopped using the bus service because of the limited number of bus stops.

A. It is not a problem at hand so it is out

B. Providing double-decker buses that will stop at as many more bus stops as possible.

C. The real issue is bus stops

D. It is possible that buses are already fully loaded but the number of bus stop is the main issue, if they increase number of stops the passengers will also increase as mentioned in the stimulus

E. Not related with the real problem.