Scientists have recently found evidence that black holes—regions of space in which matter is so concentrated and the pull of gravity so powerful that nothing, not even light, can emerge from them—probably exist at the core of nearly all galaxies and the mass of each black hole is proportional to its host galaxy.


exist at the core of nearly all galaxies and the mass of each black hole is proportional to

exist at the core of nearly all galaxies and that the mass of each black hole is proportional to that of

exist at the core of nearly all galaxies, and that the mass of each black hole is proportional to

exists at the core of nearly all galaxies, and that the mass of each black hole is proportional to that of

exists at the core of nearly all galaxies and the mass of each black hole is proportional to that of

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题目分析：
本题是两个同位语从句的并列，即，
evidence that black holes probably exist at the core of nearly all galaxies and that the mass of each black hole is proportional to that of its host galaxy.

选项分析：

A选项：较对象不对等。这个情况出现在划线部分的后半句，即：
the mass of each black hole is proportional to its host galaxy.
每一个黑洞的质量应该是和整个星系的质量相比较，而不能是和整个星系本身比较。应改为：
the mass of each black hole is proportional to the mass of its host galaxy.

B选项：Correct. 本选项在逻辑和语法上均是正确的。

C选项：比较错误同(A)。

D选项：因为主语是black holes，所以谓语动词exist也应该用复数。

E选项：主谓一致错误同(D)。

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