GMAT Sentence Correction (SC) | Re: Noted for its tenacity and courage, the English bulldog, having origin

A - No verb for English bulldog
present.
B- Sentence starts with a
modifier - singular "its "
Cannot modify plural English
Bulldogs.
C - same as B , here one more
error present .
English bulldogs( plural)....but it is( singular)
D- Error free
E- removal of "but" leads to no contrast in the sentence

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