Here's a problem to solve: Rowing a boat forward requires a force that will overcome friction from water and wind. Which factor most helps overcome the forces working against the boat?

Among the 4 following options, which is the correct answer?

- A: the length of the boat
 
- B: the height of sides of the boat
 
- C: the weight of the rowers in the boat
 
- D: the number of people rowing in the boat
 