Question

question 6
which question is not answered by the news story?
a. how long does an led bulb last?
b. why are some cities switching to led traffic lights?
c. how much does one led bulb cost?
d. what are some of the problems with led traffic lights?

Explanation:

• Option A: The text mentions "they last for seven or more years", so this question is answered.
• Option B: The text says "These lights last longer and use less energy. So cities save money", which answers why cities are switching.
• Option C: There is no mention of the cost of an LED bulb in the text.
• Option D: The text states "the bulbs don't burn hot enough to melt snow. This can cause problems for drivers", answering this question.

Answer:

C. How much does one LED bulb cost?