the Benjamin Franklin's plan to unite the 13 colonies to fight against the french and Indians was called the

He called it the "Join or Die"

Explanation:

He used it to unite the thirteen colonies and defend France. In 1756 colonist's used it to urge people to resist the unfair laws that they were forced to follow.

B. Designers could create works that were sturdy and moldable. 

I do hope this isn't from a test, if it is you should be doing your own work, but the general idea is that plastic made it easier to make decently sturdy and extremely moldable, malleable, objects. That just made collages, sculptures, and other physical artworks all that much easier to create.