The average annual temperature of a meteorological station is 26oC, its average annual rainfall is 63 cm and the annual range of temperature is 9oC. The station in is

A low annual range of temperature (9°C) and a high mean annual temperature (~26°C) point to a coastal/tropical peninsular station rather than an inland continental one. Peninsular/coastal tropical climates commonly register annual mean temperatures around 24–27°C and show small annual temperature ranges, consistent with the 26°C and 9°C given [2]. The stated annual rainfall of 63 cm falls within the 25–75 cm band noted for drier zones of peninsular/north-western plains climates, and is much lower than the heavy rainfall regimes (100+ cm) of Kolkata or Cherrapunji, or the large continental ranges expected at Allahabad [2]. Combining small annual range, mean temperature and moderate (~63 cm) rainfall best fits Chennai (Option 2).

Sources

1. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 4: Climate of India > Table 4.2 > p. 34
2. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 4: Climate of India > 7. Semi-Arid Subtropical > p. 41