The answer cannot be option B., because there is <em>no conjunction</em> after the comma is placed. The answer cannot be C., because if the comma were to interupt, the sentence would not, in fact, be grammatically correct (in context). And finally the answer cannot be D., because there is <em>no list of words and/or description</em>, after the comma. This leaves us only with option A., which is the correct answer because: after the comma is placed within the sentence, directly after it are adjective, that introduce and describe the values of her dress, which in this case would act as the direct object.
