E-waste or furr abbreviated as electronic waste includes all discarded electronic items. It also includes that electronic material that can be reused and recycled. Because of advancement in technology, older electronic items are becoming 'trash'.

The Ganges river basin is one of most fertile and densely populated regions in world that covers an area of 1,80,000 $k{m}^2$. The river flows through 29 cities with population over 100,000; 23 cities with population between 50,000 and 100,000, and about 48 towns. 

Municipal waste, commonly known as trash or garbage in U.S. and as refuse or rubbish in UK, is a waste type consisting of everyday items that are discarded by public. Garbage can also refer specifically to food waste, as in a garbage disposal;  two are sometimes collected separately. Therefore, (b) is correct answer.

When forests are destroyed, atmosphere, water bodies and water table are all affected. Trees absorb and retain water in ir roots and some of this moisture is transpired into atmosphere, regulates water cycle. When this process is broken, atmosphere and water bodies begin to dry out.