Read the following context and choose the best option to answer the question.
Context: Graphene looks like it 's going to be one of the " wonder materials " of the future , and a science team at Cornell University have just demonstrated the world 's smallest balloon made of it .
Question: Why are the scientists so excited about Graphene ?
Options: 
A. The Cornell University scientists believe that the material will lead to big developments .
B. The scientists believe the material is cost - effective .
C. The scientists believe the material is cheap and effective .
D. The scientists believe it is good for armor .


A