Equilibrium in planar forces Steps:

• Verify translational equilibrium: vector sum of all forces must be zero.
• Verify rotational equilibrium: net torque about any point must be zero.
• Examine force directions and magnitudes in each diagram.
• Identify the diagram where both conditions hold.

Why A is correct:

• Forces balance such that net force is zero and net torque is zero, per Newton's first law for rigid bodies.

Why the others are wrong:

• B: Net force nonzero, causing translation.
• C: Net torque nonzero, causing rotation.
• D: Both net force and torque nonzero.

Final answer: A