Language Aptitude Test

What, if true, would be the best reason why the sales of CFL didn't show any rise?

Directions: Answer the question based on the following passage.

The city of Orgville introduced discounts for people who use CFL. This was done with an aim to reduce the electricity consumption of the city. The Electricity Board compared the new bills with the previous ones and decided whether a household was eligible for discount or not. The program was a huge success and majority of the residents availed of the discounts. But the retailers reported no increase in the sales of CFL after the announcement of the discount program.