In recent decades, the vast majority of construction

hi sarvesh, Your reasoning is correct on your part to eliminate choice E considering cost of asbestos. But your thinking to eliminate on point of cost if wrong. Conclusion says that asbestos might have been reduced due to media news . Here we don't need to take into account or target cost factor but weaken assumtion that Asbestos is not reduced because of media factor but because of some OTHER FACTOR or something else have already made companies consume less Asbestos.
Choice E says that there are some material which have become cheaper , so this is factor which has led to reduce Asbestos. Choice is clearly saying its cheaper though not drawing clear comparison " cheaper than asbestos " , it bit understood.
Hope this helps

Cheers !