Disposable plastic plates should not be used because

Question

$\begin{array}{1 1} (a)\; \text{They are made up of toxic materials} \\ (b)\; \text{They are made up of biodegradable materials} \\ (c)\; \text{They are made up of non biodegradable materials} \\ (d)\;\text{They are two light in weight to be used} \end{array}$