Arrange the following materials in the increasing order of elasticity 

a) steel   b) lead   c) rubber   d) glass

• A measure of an object's resistance to elastic deformation is the coefficient of elasticity. 
• Copper, steel, glass, and rubber are provided. Clearly, rubber is the least elastic of these materials.
•  As a result, its coefficient of elasticity ranges from 0.1 to 0.01. Glass has an elastic modulus of between 50 and 90, steel has an elastic modulus of 210, and copper has an elastic modulus of 120. 

Hence the correct answer is c,d,b,a.