What do cell phones, personal computers, and global positioning products all have in common? A.

They are constantly getting better and faster because America's free enterprise system promotes innovation.

B

They have all reached their peak international market potential and will likely disappear in 5 to 10 years.

C.

They were invented in Asia and sold in Asian markets before being exported to American markets in the twenty-first century..

D

They would never have been invented if the U. S. government had not invested in their research and development.