The correct answer is (a).
According to the Census 2011, the districts of Uttar Pradesh having highest literacy rate are:
- Ghaziabad - 82.09%
- Gautam Buddh Nagar - 80.05%
- Kanpur City - 78.25%
- Auraiya - 69.37%
Therefore, the correct descending order is:
- Ghaziabad
- Gautam Buddh Nagar
- Kanpur City
- Auraiya