Which of the following statements is false?

a. Computers can perform calculations and make logical decisions phenomenally faster than human beings can.
b. Supercomputers are already performing thousands of trillions (quadrillions) of instructions per second.
c. Unfortunately, silicon is expensive, so it has made computing more costly.
d. Computers process data under the control of sequences of instructions called computer programs.

c. Unfortunately, silicon is expensive, so it has made computing more costly. Actually, silicon is inexpensive – it's an ingredient in common sand.