A sigma bond may be formed by the overlap of two atomic orbitals of atoms A and B. If the bond is formed along the `x-` axis, which of the following overlaps is acceptable ?
A. s orbital of A and `p_(z)` orbital of B
B. `p_(x)` orbital of A and `p_(y)` orbital of B
C. `p_(z)` orbital of A and `P_(x)` orbital of B
D. `p_(x)` orbital of A and s orbital of B
