The correct option is
B to show the dominance of women in advertising
From the line that, "whatever she does, her image sells", and the first line that "
the image of an attractive woman is the most effective advertising gimmick", it is clear that the writer is trying to convey the fact that women play a big role in advertising, hence showing dominance, hence Option B is the correct answer.Option A is incorrect because "to ridicule women" means to insult or use dismissive language which is not the case here, as the writer only expresses what he feels about female dominance n the are of advertising.
Option C is incorrect because "to portray the obsession of women with trivial things" means that women indulge in less important activities, which is not true as female dominance is all that the writer tries to convey.
Option D is incorrect because "emancipation" means to free someone from a legal bond or slavery, which is incorrect because the paragraph only tells that women are given more importance and make it through easier in the advertising industry, which does not depict freeing from slavery in any manner.