Which of the Following Best Describes an Orbital

Multiple Choice

Which of the following best describes an orbital?

A) space where electrons are unlikely to be found in an atom
B) space which may contain electrons,protons,and/or neutrons
C) the space in an atom where an electron is most likely to be found
D) small,walled spheres that contain electrons
E) a single space within an atom that contains all electrons of that atom