The known forces of nature can be divided into four classes, viz, gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?
Statement A is incorrect: Gravity is actually the weakest of the four fundamental forces for a given distance. Statement B is correct: Electromagnetism acts only on charged particles, where the charge can be negative or positive. Statement C is correct: The weak force is responsible for the existence and structure of atomic nuclei, including radioactivity and nuclear fusion. Statement D is correct: Strong nuclear force is responsible for holding protons and neutrons together inside the atomic nucleus and is 100 times stronger than electromagnetism.