# This polymer is used for making cups and plates which are quite hard and durable:-

$\begin{array}{1 1}(a)\;\text{Melamine formaldehyde resin}&(b)\; \text{Natural rubber}\\(c)\;\text{Teflon}&(d)\;\text{Orlon}\end{array}$

Melamine formaldehyde resin is used in making crockery.These are used for making cups and plates which are quite hard and durable.They do not break on being dropped.
Hence (a) is the correct answer.