After culturing the anther of a plant, a few diploid plants were found along with haploid plants. The diploid plants could have arisen from
(a) generative cell of pollen.
(b) cells of anther wall.
(c) vegetative cell of pollen.
(d) exine of pollen wall.

Dear student,

The diploid plants would have arisen from the cells of anther wall (option b).
This is because the generative cell, vegetative cell and exine of pollen are all haploid in nature.
 Hence any plant that would have have arisen from them will have to be haploid.
Thus the cells of anther wall being diploid gave rise to the diploid plants.

Regards