Question

what is the primary drawback about led bulbs?
excessive heat production
high initial cost
short lifespan

Explanation:

LED bulbs are known for low heat production and long lifespan. However, their primary drawback is the relatively high initial cost compared to traditional bulbs like incandescent. Excessive heat production is not a drawback of LEDs (they are more efficient in heat management), and short lifespan is incorrect as LEDs have long lifespans.

Answer:

B. high initial cost