Most high-priced sweaters are of good quality, and a few low-priced sweaters are of good quality. All good-quality sweaters are comfortable to wear. According to the above proposition, which of the following can be inferred? ['The price is completely proportional to the quality of the sweater.', 'Compared to cheap sweaters, higher-priced sweaters tend to be more comfortable to wear.', 'Sweaters that are comfortable to wear are expensive.', 'Sweaters that are comfortable to wear are not all good quality sweaters.']