SAT English Practice Question

The following sentence contains an error in punctuation. The sentence is: "As a young girl, Margaret was a precocious reader, voraciously devouring books on history, science, and literature— however, she preferred to read in secret, hiding away in quiet corners, so as to not be disturbed." Which of the following is the best way to correct the error in the sentence?

1. A.As a young girl, Margaret was a precocious reader, voraciously devouring books on history, science, and literature; however, she preferred to read in secret, hiding away in quiet corners, so as to not be disturbed.
2. B.As a young girl, Margaret was a precocious reader, voraciously devouring books on history, science, and literature, however, she preferred to read in secret, hiding away in quiet corners, so as to not be disturbed.
3. C.As a young girl, Margaret was a precocious reader, voraciously devouring books on history, science, and literature, however, she preferred to read in secret, hiding away in quiet corners, so as to not be disturbed.
4. D.As a young girl, Margaret was a precocious reader, voraciously devouring books on history, science, and literature—however, she preferred to read in secret, hiding away in quiet corners, so as to not be disturbed.