Which of the following stamens regarding the duration of day and night is correct? [NDA 2014-I]

• A. Difference is least near the Equator and progressively increases away from it
• B. Difference is maximum at the Equator and progressively decreases away from it
• C. Difference is least at the Tropics and progressively increases towards the Equator and Poles
• D. Difference is maximum at the Tropics and progress decreases towards the Equator and Poles