The correct option is B Monday
To find the New year's day celebrated in 2007, we will find the day on 1st Jan;2007.
1st Jan 2007 = 2006 years + 01/01/2007
2000 years have 0 odd days.
Now, 6 years comprise of 1 leap year and 5 ordinary years.
So, the number of odd days in 6 years =1 2 + 5 = 7 days or 0 odd days.
There are 0 odd days till 31st Dec 2006.
Therefore, the day on 1st Jan 2007 is Monday.
Hence, option (B) is the correct answer.