* Coulomb's Law: The electric force between two charged objects is described by Coulomb's Law. This law states that the force is:

* Directly proportional to the product of the charges: Larger charges result in a stronger force.

* Inversely proportional to the square of the distance between them: As the objects get further apart, the force weakens rapidly.

Let's look at the other options:

* A) Their masses and their separation: Mass is relevant for gravitational force, not electric force. While separation is important (as mentioned above), it's not the only factor.

* B) Speeds: The speed of charged objects affects the magnetic force they experience, but not the electric force between them at rest.

In summary, the electric force between two charged objects is primarily determined by the magnitude of their charges.