Identify which of the sequences below is a geometric sequence.
A1, 3, 5, 7, 9,
B2, 4, 6, 8, 10,
C2, 5, 7, 10, 12,
D3, 6, 12, 24, 48,
A1, 3, 5, 7, 9,
B2, 4, 6, 8, 10,
C2, 5, 7, 10, 12,
D3, 6, 12, 24, 48,