Haley Discovers a New Way to Design Automobile Engines So

Multiple Choice

Haley discovers a new way to design automobile engines so that they use less gasoline. Haley's finding is an example of

A) physical capital. If Haley's discovery leads to lower gasoline prices, it has made gasoline less scarce.
B) physical capital. If Haley's discovery leads to lower gasoline prices, it has made gasoline scarcer.
C) technological knowledge. If Haley's discovery leads to lower gasoline prices, it has made gasoline less scarce.
D) technological knowledge. If Haley's discovery leads to lower gasoline prices, it has made gasoline scarcer.