Match the items of column-I with column-II and choose the correct option.

	Column-I		Column-II
A.	UV	i.	Biomagnification
B.	Biodegradable organic matter	ii.	Eutrophication
C.	DDT	iii.	Snow blindness
D.	Phosphates	iv.	BOD

	A	B	C	D
1.	ii	i	iv	iii
2.	iii	ii	iv	i
3.	iii	iv	i	ii
4.	iii	i	iv	ii

• A

  1

• B

  2

• C

  3

• D

  4