GMAT Sentence Correction (SC) | Re: Many of the earliest known images of Hindu deities in India

Hi All,

Many of the earliest known images of Hindu deities in India date from the time of the Kushanempire, fashioned either from the spotted sandstone of Mathura or Gandharan grey schist.

D. empire and either fashioned from the spotted sandstone of Mathura or from

Choice D is incorrect for two reasons.
1.The first error is a parallelism error. This sentence has two markers “either… or…”. What follows the first marker must follow the second marker also. Here “either” is followed