Context: Ethan gives two friends a ride in his wagon. One friend sits in the wagon at a time.
Ethan starts to pull the wagon across the yard. To move the wagon at the same speed each time, which friend does Ethan need to pull with a larger force?
A. a friend who weighs 21 pounds
B. a friend who weighs 28 pounds
Identify the correct option from the choices provided and respond with the letter of the correct option.

B