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.