In molecules, C, H, O, and N atoms usually make __, __, __, and __ bonds respectively.

In molecules, C, H, O, and N atoms usually make __, __, __, and __ bonds respectively.

3, 2, 4, 2

2, 1, 3, 4

3, 2, 1, 4

4, 1, 3, 2

4, 1, 2, 3

The answer is :

4, 1, 2, 3.