GMAT Sentence Correction (SC) | Re: SC Concepts with examples

A.-> "who" is modifies the preceding noun entity "the American theater".
-> Hereincluding modifies the entire phrase i.e.
Several generations of actors modifies Marlon Brando and Robert De Niro

B.It converts the main information as additional information
(Note:Main information: Stella Adler was one of the most influential artists in the American theater)

C. Correct Answer
Verb-ing training is correctly used to
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