The correct answer is
A) true
In fact, the electrical force can be present only if the two objects have a net charge different from zero, because the electrical force is proportional to the value of the charges:
[tex]F_e = k_e \frac{Q_1 Q_2}{r^2} [/tex]
so, if they are neutral they cannot exert an electrical force between each other, because their charge Q is zero.
Viceversa, the gravitational force is always present when the objects have masses, since the force is proportional to the value of the masses:
[tex]F_g = G \frac{m_1 m_2}{r^2} [/tex]
so, even if the two objetcs are neutral, if they have mass, they exert a gravitational force to each other.
