Which of the following correctly punctuates a nonessential expression?

A) Spain attempted reforms, which proved largely ineffectual, to help the condition of the Native Americans.

B) Spain attempted reforms which proved largely ineffectual, to help the condition of the Native Americans.

C) Spain attempted reforms, which proved largely ineffectual to help the condition of the Native Americans.

D) Spain attempted reforms which proved largely ineffectual to help the condition of the Native Americans.

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Hagrid
The correct answer for this question is: The statement that correctly punctuates a nonessential expression is 'A) Spain attempted reforms, which proved largely ineffectual, to help the condition of the Native Americans.'

The usage of the word 'which' here is nonrestrictive. This means that when you could take the which clause out and the meaning of the sentence would be unaltered.