Which of the Following Statements Is True

Which of the following statements is true?

A) Valence electrons reside in the innermost shell of an atom.
B) The number of orbitals that an atom has is the same for all elements.
C) An orbital is a space around the nucleus of an atom where a proton is likely to be found.
D) An orbital is a space around the nucleus of an atom where an electron is likely to be found.