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"Freedom Riders" were African American and white civil rights activists, who traveled together on buses into the southern states of Mississippi and Alabama to test the Supreme Court ruling that segregation on interstate buses was unconstitutional and forcing federal police to protect the protesters' rights.
This answer choice is grammatically incorrect. The construction A and B (traveled and forcing) requires that A and B belong to the same part of speech. In this case, A (traveled) is a conjugated verb, whereas B (forcing) is a non-conjugated verb.[[snippet]]
While this answer choice corrects the Parallelism mistake in the original question by changing forcing to forced (to parallel traveled), it changes the meaning of the original question.
In the original sentence, the activists test the ruling of the Supreme Court, whereas in the corrected sentence they test the constitutionality of the Supreme court.
While this answer choice corrects the Parallelism mistake in the original sentence by changing the
While this answer choice corrects the Parallelism mistake in the original sentence, by changing the words and forcing to forcing, it is illogical and changes the meaning of the original sentence.
By changing and forcing to forcing, the corrected sentence changes the parallel construction with and to a modifying clause, which is not required to be grammatically parallel to traveled.
However, in the original sentence segregation is unconstitutional, but in the corrected sentence the Supreme court ruling is unconstitutional.[[snippet]]
While this answer choice corrects the grammatical Parallelism of the original question by changing forcing to to force (making it parallel with to test), it introduces a new grammatical mistake.
The plural verb were does not agree with the singular subject segregation.
This answer choice corrects the Parallelism mistake in the original question by changing the non-conjugated verb forcing to the conjugated verb forced (to parallel traveled).