Which expression is equivalent to 3^3 · 6^3 · 23 without exponents? A) 3 + 3 + 3 + 6 + 6 + 6 + 2 + 2 + 2 B) 3 x 3 x 3 x 6 x 6 x 6 x 2 x 2 x 2 C) 9 + 18 + 6 D) 9 x 18 x 6