The known forces of nature can be divided into four categories, namely gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?

• A. Electromagnetism only acts on particles with electric charge
• B. Strong nuclear force holds protons and neutrons in the nucleus of an atom
• C. Weak nuclear force is the cause of disintegration
• D. gravity is the strongest of the four