Clear parentheses by applying the distributive property.
3(–3n + 7) – 8(6p – 9q)

A. –9n + 7 – 48p + 9q
B. –9n + 7 – 48p – 9q
C. –9n + 21 – 48p + 72q
D. –9n + 21 – 48p – 72q