Write a question about the following article.

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 ?
Choose your answer from:
1). The Cornell University scientists believe that the material will lead to big developments .
2). The scientists believe the material is cost - effective .
3). The scientists believe the material is cheap and effective .
4). The scientists believe it is good for armor .