The investigation, _____ will soon be published, was made by Joh

The investigation, _____ will soon be published, was made by John.
A、at which the results
B、the results on which
C、whose results
D、at whose results
【正确答案】：C
【题目解析】：本题测试定语从句的用法。从句中results的定语应该是调查的，所以此处应该用whose来引导。本句的意思是：“调查的结果将很快公布，这项调查是由约翰开展的。”