在星系模型中，距离中心较远的恒星仍然是系统的一部分。哪个陈述最能体现其中的原因？单项选择题

A

星系质量的综合引力使遥远的恒星与该系统紧密相连。

B

边缘的恒星根本感受不到任何力量。

C

外层恒星粘在星系的边缘。

D

轻微的压力将恒星向内推，使它们保持连接。

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