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A has parallelism.. center of the milkyway and of...the
B. has a possesive noun.. i.e. an apostrophe and hence violates parallelism.. see it says a black hole lies at the Milky ways' center and of the .... but this sentence does not refer to center of 100 billion other galaxies..
The problem in B is that the second arm after the conjunction ‘and’ is just a dangling phrase without a working verb; even if you attach it to the earlier verb lies at, it doesn’t make sense. _________________