单选题 This leads record companies to treat musicians as contracted artists who are not paid a fixed sum for their labor-time, but instead receive royalties in ______ to their success.
A. addition B. relation C. percentage D. proportion

【正确答案】 D
【答案解析】[解析] “签约艺术家们不按工作时间领取固定报酬，而是……成功程度(唱片销售量) 收取版税”。A项in addition to意为“除了……之外”；B项in relation to意为“涉及，关于”； C项in percentage of/in percentage意为“按比例”，但不存在in percentage to的用法；D项 proportion意为“比例，份额”，in proportion to意为“与……成比例”，符合题意。