Stationary Electron Forces Steps:

• Electrons have mass, so they experience gravitational force in a gravitational field.
• Electrons are charged particles, so they experience electric force in an electric field.
• Magnetic force requires velocity; a stationary electron has zero velocity, so no magnetic force.
• Thus, only gravitational and electric fields exert forces on it.

Why C is correct:

• By Newton's law of gravitation (F_g = mg) and Coulomb's law (F_e = qE), a stationary electron feels both forces, but Lorentz force (F_m = q(v × B)) is zero for v=0.

Why the others are wrong:

• A: Excludes gravitational force, which acts due to the electron's mass.
• B: Excludes electric force, which acts due to the electron's charge.
• D: Includes magnetic force, which requires motion and is absent for a stationary electron.

Final answer: C