Step 1: Understand the definition of an electron volt (eV). An electron volt is the amount of kinetic energy gained by a single electron when it is accelerated through an electric potential difference of one volt.

Step 2: Relate the electron volt to energy:

• 1 eV = 1.602 x 10^-19 joules.

Step 3: Analyze the options:

• Option A: Charge is measured in coulombs, not electron volts.
• Option B: Potential difference is measured in volts, not electron volts.
• Option C: Momentum is measured in kg·m/s, not electron volts.
• Option D: Energy is measured in joules; since an electron volt is a unit of energy, this is correct.

Therefore, the correct answer is D.