Which country topped the list on "World Happiness Index", 2015 published by the sustainable Development Solutions Network (SDSN)?

Which country topped the list on "World Happiness Index", 2015 publish

1.	Which country topped the list on "World Happiness Index", 2015 published by the sustainable Development Solutions Network (SDSN)?
A.	Bhutan
B.	Switzerland
C.	Iceland
D.	Norway
Answer» C. Iceland