单选题 Public acceptance of rabbit as an economical source of protein depends on ______.
A. how aggressively do producers market it B. if it marketed aggressively
C. how aggressively producers market it D. whether or not aggressive marketing

【正确答案】 C
【答案解析】[答案详解] depend on后面加一个从句，从句语序应为陈述语序。