请教一道GRE心理学与生活的题

You have just memorized a list of nonsense words. you are going to try to recall the words everyday for next 30 days (without looking back at the list). You would expect to show the most forgetting between _____ A、day 1 and day 2 B、day 3 and day 5 C、day 5 and day 10 D、day 10 and day 30 感觉选C, 因为觉得是系列位置效应、中间的记忆最差。但是答案是A为什么？Psychology And Life上面的请大家指点谢谢了。