Option (B) Chandigarh is correct. Day length varies with latitude. In the Northern Hemisphere, during summer (around June 21st when the sun is directly overhead at 23.5°N), places located further north experience longer days. Among the given cities, Chandigarh is situated at the highest latitude (northernmost position), hence it experiences the longest days compared to Tiruvanantpur, Hyderabad, and Nagpur, which are located further south (closer to the equator).