At distances greater than 2 femtometers, the nuclear strong force is stronger than (select all that apply):

gravity

electromagnetic forces

nuclear weak force

none of the above

The correct answer is

nuclear weak force

In fact, the nuclear strong force has a very limited range of action (approximately below 1-2 femtometers), and its magnitude decays exponentially for larger distances. Only the nuclear weak force is weaker than the nuclear strong force at large distance, while the gravity and the electromagnetic force become dominant for distances > 2 femtometers.