What is the next step in the pattern?
3 × 6 = 18, 6 × 3 = 18, 18 ÷ 6 = 3, ____
A3 × 7 = 21
B3 ÷ 18 = 6
C4 × 6 = 24
D18 ÷ 3 = 6
3 × 6 = 18, 6 × 3 = 18, 18 ÷ 6 = 3, ____
A3 × 7 = 21
B3 ÷ 18 = 6
C4 × 6 = 24
D18 ÷ 3 = 6