The correct answer is option 3, Guwahati. The 33rd National Games were held in Guwahati in February 2007. It is important to note that the National Games are a recurring multi-sport event held in India, where athletes from different states and union territories compete against each other.

Option 1, Bhopal, is incorrect. While Bhopal has hosted the National Games in the past, it was not the location for the 33rd edition in 2007.

Option 2, Chandigarh, is also incorrect. Chandigarh has never hosted the National Games in its history.

Option 4, Hyderabad, is also incorrect. Hyderabad has hosted the National Games twice, in 2002 and 1979, but it was not the location for the 33rd edition in 2007.

Therefore, the correct answer is option 3, Guwahati, as it was the host city for the 33rd National Games in February 2007.