By pressing a tiny amount of nitrogen between two diamonds to a pressure of 25 million pounds per square inch, scientists not only were able to transform the gas into a solid, but they also created a semiconductor similar to silicon.

• Anot only were able to transform the gas into a solid, but they also created  
• Bnot only were able to transform the gas into a solid but also creating  
• Cwere able not only to transform the gas into a solid but to create  
• Dwere able not only to transform the gas into a solid but also creating  
• Ewere not only able to transform the gas into a solid, but they were also able to create