A company installs an energy-saving machine in the production line. This is related to which change?

Correct answer: Technological improvement

The governing concept is technological change in business operations. A machine is a productive technology, and replacing or upgrading it to consume less energy improves operating efficiency. The action may lower power use, reduce wastage, and potentially decrease production cost while maintaining the same output, so option A, technological improvement, is correct. Political promotion concerns political communication, a social custom is a practice followed by a group, and foreign policy concerns relations between countries. Those alternatives do not describe a change in the production equipment. The question asks what kind of change the installation represents, not which external policy caused it; therefore the direct technological classification is the appropriate answer.