A description is vivid if it contains details that allow the reader to create a clear mental image about the object, person or situation being described. In this context, to create a vivid description it is necessary to add precise details.
According to this, the best word is "sauteed" because this is more specific than "cooked" or "prepared"; also, this verb is related to the specific action of frying something for a short time and using little oil, and therefore when readers encounter this word they can imagine precisely the situation described.
D) Sautéed provides the most vivid description because it is a very specific act of cooking something in hot oil, where as the others are much more general. It gives you a clear and vivid picture of the eggplant searing in the plan.
