Diazo compounds,sometimes donot respond Lassaigne's test for nitrogen because

Question

$\begin{array}{1 1}(a)\;\text{These contain very little carbon}\\(b)\;\text{These are quite stable compounds and do not decompose to elemental nitrogen}\\(c)\;\text{Their nitrogen contents is removed,during heating in the form of nitrogen gas}\\(d)\;\text{These form organo metallic compounds with sodium}\end{array}$