When one material is rubbed against another, electrons jump readily from one to the other. why don't protons do that? 1. electrons can attract each other while protons repel each other. 2. electrons are easily dislodged from the outer regions of atoms, but protons are held tightly within the nucleus. 3. electrons are much heavier than protons. 4. electrons are much lighter than protons. 5. electrons travel at the speed of light while protons move very slowly?

Choice 3 is an outright lie. Just the opposite is true. 

Choice 1 is also a fabrication (lie) . Neither electrons are attracted to other electrons nor are protons attracted to other protons. Electrons are attracted to protons, and protons work on a system of charge transfer. In the hydrogen atom the single electron is attracted to the single proton. (The most common of hydrogen atoms is 1 electron and 1 proton.)

While 4 is true, it is not the explanation.

Choice 5 is not true. Electrons do not move at the speed of light. Heaven help us if they did.

We need a drum roll. The answer must be 2 and it is.