The answer is stationary neutrons. Static charge refers to the accumulation of electric charge on an object that remains at rest. It occurs when there is an imbalance of electrons (negative charge) or protons (positive charge) on the object's surface.
Moving electrons and stationary electrons can both contribute to static charge. Moving electrons, specifically, are responsible for the flow of electric current in conductors. Stationary protons can also contribute to static charge, although they are less common in everyday situations.
Neutrons, on the other hand, do not possess an electric charge. They are electrically neutral particles and do not contribute to static charge.