He saw it as a rare opportunity to attend the annual ____ as a p

He saw it as a rare opportunity to attend the annual ____ as a production assistant.
A、prevention
B、precaution
C、convention
D、conclusion
【正确答案】：C
【题目解析】：prevention预防；precaution预防，警惕；convention大会，惯例；conclusion结论。句意：他认为这是一个难得的机会，以生产助理的身份参加年会。