1. Which statement BEST explains why coal is used to generate electricity despite the amount of pollution produced by burning coal?
A Compared to other fuels, coal produces more energy per kilogram.
B. Compared to other fuels, coal is relatively cheap and plentiful.
C. Coal burns without producing greenhouse gases.
D. Coal is a renewable source of energy.

4d^55s^1 ( third choice)

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.