参考答案：D

解析：

译文:一些斯皮尔伯格最为成功的电影来自于_________?

原文中相关的信息为:

Even decades later, Spielberg says he has clear memories of his earliest years, which are the origins of some of his biggest hits．甚至是数十年之后,斯皮尔伯格提到他早年的经历仍然记忆犹新,这些成为了他日后人们影片的素材。

题干中的“most successful movies”对应文中的biggest hits（大片）。早年的记忆 clear memories of his earliest years,只有D选项。his childhood memories最为符合。

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