Which of the Following Statements Regarding Valence Bond Theory Is $\sigma$

Which of the following statements regarding valence bond theory is true?

A) Hybrid orbitals cannot contain lone pairs of electrons.
B) A single bond can be described as an electron pair in a $\sigma$ bond that is localized between two atoms.
C) A double bond can be described as two $\pi$ bonds occupied by four electrons.
D) The magnetic properties of a molecule are readily explained.
E) There is no provision for atoms with expanded octets.