Why are the noble gases such as helium (He) and neon (Ne) grouped together in the periodic table?
A- They are nonreactive gases.
B-They are highly reactive metallic solids.
C-They are dangerous gases when combined with water.
D-They are liquid at room temperature and have high boiling points.

the answer would be b i believe

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.