Whittier had used symbolism and imagery of war in his poem "To William Lloyd Garrison" when he described the rural nature of the New England including its cultural atmosphere, as well as its religion. In addition, Whittier was among the most prominent poets wherein among his main subject was the American Civil War.
No it is not correctly written.
I would definitely go with option A.
Assuming that the underlined word is chosen, the correct answer is C) past participle.
A would be - chose.
B would be - choosing.
D would be - choose/chooses.
