C

Step 1: Understand the concept of elasticity. Elasticity refers to the ability of a material to return to its original shape after being deformed.
Step 2: Identify the materials in the options. Glass, Quartz, Rubber, and Metals each have different elastic properties.
Step 3: Rubber is known for its significant elastic properties, allowing it to stretch and compress and return to its original shape easily.
Step 4: In contrast, Glass and Quartz are brittle, meaning they will break or shatter rather than deform elastically; Metals exhibit elasticity but are not as pronounced as that of rubber.
Therefore, the material for which the effects of elasticity are maximum is Rubber.