Refer to fig. 2 and place the events in their proper relative order from oldest to youngest.
1) O c, f, a, d, b, g, e
2) O e, g, d, b, c, f, a
3) O e, g, b, d, a, f, c
4) O e, g, b, a, c, d, f
5) O d, e, g, b, a, f, c