Electric force is directly related to charge.
According to Coulomb's law, the electric force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. This means that if the charge on one of the objects increases, the electric force between them will also increase proportionally, assuming the distance between them remains the same.
Therefore, the correct answer is:
B. Directly related to charge.
