Is not only the most valuable precious metal, but it is also both aesthetically and intrinsically pleasing, and retains religious or symbolic meaning in many cultures.
a. silver
c. iron
b. bronze
d. gold

The correct answer is option d, that is, Gold.  

Explanation: Gold can hold various distinct significances, in terms of economy, it can attain material value, in social contexts it can acquire meaning for position and status within an ordered composition, and in terms of religion, it can be used to articulate admiration of the divinity or a divine.  

The symbolic nature of gold can be illustrated as a means of communication, this signifies, firstly, communication between the humans in distinct conditions for distinct purposes, however, also secondly between the humans and a spiritual world.  

d

Explanation:

i have no clue hope you find the answer

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.