Place Two Identical 3-Solar-Mass Black Holes Side by Side

Multiple Choice

Place two identical 3-solar-mass black holes side by side. Add 1 solar mass of neutrons to the left-hand one and 1 solar mass of protons to the right-hand one. How will these two black holes differ?

A) The black holes will not differ at all since protons and neutrons are transformed into a common type of uncharged matter.
B) The left-hand black hole will have a stronger gravitational field than the right-hand one because a neutron is heavier than a proton.
C) The left-hand black hole will emit electrons and neutrinos as its neutrons decay into protons.
D) The left-hand black hole will be electrically neutral and the right-hand one will have an enormous electric charge.