The correct option would be d. Located mainly on her trunk.
Chronic psoriasis causes lesions that are often erythematous patches and plaques, which may appear on the knees, elbows, back of the scalp, palms and soles, and the genitalia. While these areas may be common sites for lesions, psoriasis vulgaris may also appear on the trunk, making option d the correct answer. Additionally, lesions can often present in a scattered pattern across multiple areas, so the trunk is just one potential site for psoriasis vulgaris lesions to appear.