Question

two vectors A and B are such that A+B=A-B.Then
a-A.B=0
b-A*B=0
c-A=0
d-B=0

Answer 1

Algebraically, 2B=A-A=0

Thus B=0

You can test this by assuming it's a 2D vector and breaking down into hypothetical components.

In any case, correct answer is d