The subject of the sentence is "one of the most problematic ethnic groups", a singular noun.
The verb, however, is "were," which is plural. We need to find a choice that uses a singular
verb instead.
(A) This choice is the same as the original sentence.
(B) This choice does not correct the subject-verb issue; it still uses "were" to refer to "group."
(C) This choice uses the singular "was," but the simple past is not the appropriate tense here
...
The verb, however, is "were," which is plural. We need to find a choice that uses a singular
verb instead.
(A) This choice is the same as the original sentence.
(B) This choice does not correct the subject-verb issue; it still uses "were" to refer to "group."
(C) This choice uses the singular "was," but the simple past is not the appropriate tense here
...
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