Which sentence correctly uses “crucial”？ （）

Which sentence correctly uses “crucial”？ （）
A、It is crucial the problem is tackled immediately.
B、Getting a college degree could be crucial your prospect of finding a job.
C、Establishing a shared destiny among ethnic groups is crucial to achieving ethnic harmony.
D、Kinkeeping plays crucial role in a family’s health and well-being.
正确答案：Establishing a shared destiny among ethnic groups is crucial to achieving ethnic harmony.