Units matching physical quantity definitions

Steps:

• Identify standard SI units for each quantity.
• Acceleration: m s^{-2} from v = u + a t.
• Electric current: A from flow of charge per time.
• Electric potential difference: J C^{-1} from work per unit charge.
• Kinetic energy: N m from force times distance.

Why C is correct:

• Electric potential difference is defined as work done (energy in J) per unit charge (C), so unit is J C^{-1} by V = W/Q.

Why the others are wrong:

• A: Unit m s^{-2} is correct for acceleration but not expressed as energy per charge.
• B: Unit A s^{-1} is incorrect; current is A, while A s^{-1} is for current change rate.
• D: Unit N m equals J for energy but not specific to kinetic energy via charge relation.

Final answer: C