# Which orbital hybridization is associated with a tetrahedral charge cloud arrangement ? A) sp B) sp^3d^2 C) sp^3 D) sp^2

The answer is C) $s {p}^{3}$.
In this case, a steric number equal to 4 corresponds to 4 hybrid orbitals $\to$ one s-orbital and three p-orbitals $\to$ $s {p}^{3}$ hybrid orbitals.