It was Sunday on Jan 1, 2006. Discover the week's day on Jan 1, 2010.
Answer: C
On 31st December,2005 it was Saturday.
Number of odd days frame the year 2006 to the year 2009=(1+1+2+1)=5 days.
∴ On 31st December 2009 , it was Thursday.
In this way, on first jan, 2010 it is Friday.