A the most B a most C most D the more
個人認為選B
experience 經驗（不可數）
He has had no previous experience in this kind of job.
他從前沒有做這種工作的經驗
experience 經歷（可數）
I had a singular experience in Africa.
我在非洲時有過壹次奇特的經歷。
The shipwreck was a harrowing experience.
那次船難是壹個慘痛的經歷。
It's an unforgettable experience.
這是壹次難忘的經歷。
根據上面的解釋，本句中的experience就理解為“經歷”更好。