Read the paragraph, then choose the word that best completes the sentence.

Question

The incandescent bulb has been a mainstay for over a century. The bulb produces light by heating a wire until it glows. Although bright, 90 percent of the electricity used by incandescent bulbs is lost as heat. Newer technologies, such as light-emitting diodes (LEDs), compact fluorescent bulbs, and halogen bulbs are less wasteful. They convert nearly all of the electricity they use into light. Eager to save money, officials have passed laws to phase out the older bulbs.
The new bulbs are more _
A
radiant
B
durable
C
efficient

D
focused

Answer 1

The new bulbs are more C efficient.