Meaning analysis:
The sentence states that the producers are closing Meet Pauline, which is the first Broadway musical written by a large group of composers and itwas the the inspiration for a plethora of similar works that crowded Broadway for years after.

Error Analysis:
'had been' is incorrectly used since we don't have sequence of events. There is a parallelism error too - 'that had been written' and the 'inspiration' are not parallel.

A. Incorrect as mentioned above.
B. 'which was' is not parallel to 'had been'
C. This sentence reckons that the musical is yet to be written.
D. Concise and correct.
E. 'to have been' makes the sentence awkward.