The number of lattice points per unit cell in B.C.C and end centered lattice respectively

Each atom, molecule, or ion (constituent particle) in a crystal lattice is represented by a single point. The terms "lattice site" and "lattice point" refer to these points. In a crystal lattice, the sites or points are connected by a straight line.

As, we can see in diagram, Body Centered Cubic (BCC) have 9 lattice points, and End Centered Cubic (ECC) have 10 lattice points, 

Therefore, the correct option is B 9,10