A \( \text{R}_2\text{NH} < \text{RNH}_2 < \text{R}_3\text{N} < \text{NH}_3 \)
B \( \text{R}_2\text{NH} > \text{RNH}_2 > \text{R}_3\text{N} > \text{NH}_3 \)
C \( \text{NH}_3 > \text{RNH}_2 > \text{R}_2\text{NH} > \text{R}_3\text{N} \)
D \( \text{NH}_3 < \text{RNH}_2 < \text{R}_2\text{NH} < \text{R}_3\text{N} \)