根据下表中有机物的分子式排列规律，判断空格中物质的同分异构体数目是
| 1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
| CH4 |
C2H4 |
C3H8O |
|
C5H10 |
C6H14O |
C7H16 |
C8H16 |
C9H20O |
A．2 B．3 C．4 D．5
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