Confused between (b) and (d)

If we check the symmetry operation ( Plane of symmetry, centre of symmetry, Improper axis of rotation) both B and D have none, therefore should be optically active. But now we hav...

It is MSQ type question, option B and D both are optically active because POS, COS both are absent

Sir ,this is MCQ type question ...from b and d which optn is correct

b and d are optically active just pass the plane passes through tbutyl and me and then see.