Final answer:
The sentence that describes a commercial appealing to ethos is Option A: An ad to sell skin-care products features a medical doctor who approves the products.
Step-by-step explanation:
The sentence that describes a commercial appealing to ethos is Option A: An ad to sell skin-care products features a medical doctor who approves the products. Ethos is an appeal to ethics or credibility, and in this case, the presence of a medical doctor endorsing the skin-care products enhances the credibility of the ad and appeals to ethos. The doctor's expertise and professional experience lend credibility to the effectiveness of the products, making it more persuasive to the audience.
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