B. a negative charge, found outside the nucleus
The electron orbits around the nucleus in the electron shells/electron cloud. To give you a visual image of the movement of electrons think of our solar system. The planets orbiting the sun. In this case the sun would be the nucleus and the planets are the electrons. The nucleus is charged positively. Well, the nucleus is composed of protons, which are positive, and neutrons, which have a neutral/no charge. Even though there is one set of particles that has no charge it doesn't affect the positive charge of the protons, which means that the overall charge of the nucleus is positive. In order for the electrons to orbit the nucleus in the way it does it must be both attracted and repelled, meaning that it needs to have the opposite charge (aka negative charge) of the nucleus.
Hope this helped!
~Just a girl in love with Shawn Mendes
