(A) If AB4 is a square planar molecule, then

Given that the vector sum of the dipole moment is zero, it should not be polar.

(B) If the rectangular planer AB₄ is true, then

Given that the vector sum of the dipole moment is zero, it should not be polar.
(C) Since AB₄ has no lone pairs and is a tetrahedral molecule, their structure should be:

Additionally, due to perfect symmetry, it should not be polar.

(D)If AB₄ has a square pyramidal shape, then its lone pair should have the following structure:

and it ought to be polar because a single pair of 'A's' dipole moment cannot ever be cancelled by another pair.

Therefore, the correct option is D Square Pyramidal