题目选项分析

Which of the following best completes the passage below?

>Since an experienced, top-rated race car driver is now constantly losing a race he once won before he acquired a certain race car, he plans to junk the race car he is currently using and replace it with a better model. The improved and new race car model is more likely to improve the race car driver's performance than any other factor because

【选项】the driver may not necessarily have been able to overcome other obstacles during recent races