This question tests AP Physics C: Mechanics skills, specifically understanding torque and rotational dynamics with focus on comparing torques from forces at different angles. For maximum torque, the force should be perpendicular to the lever arm. F₁ acts perpendicular to the door, producing τ₁ = (1.00 m)(10 N)sin(90°) = 10 N·m. F₂ acts at 30° to the door, producing τ₂ = (1.00 m)(10 N)sin(30°) = 5 N·m. Choice A is correct because the perpendicular force F₁ produces greater torque (10 N·m) than the angled force F₂ (5 N·m). Choice C might result from not considering the angle effect on torque magnitude. To help students: Demonstrate that torque is maximized when force is perpendicular to the lever arm. Use visual aids to show how the effective force component decreases as the angle deviates from 90°.