Which expression is equivalent to 21 × 7?
A7 × 21
B(3 x 7) + 7
C(10 + 7) × 11
D(21 + 7) × (7 + 21)
30 points
A7 × 21
B(3 x 7) + 7
C(10 + 7) × 11
D(21 + 7) × (7 + 21)