According to Census 2011, the correct descending order districts of Uttar Pradesh having highest literacy rate is:

The correct answer is (a).

According to the Census 2011, the districts of Uttar Pradesh having highest literacy rate are:

1. Ghaziabad – 82.09%
2. Gautam Buddh Nagar – 80.05%
3. Kanpur City – 78.25%
4. Auraiya – 69.37%

Therefore, the correct descending order is:

1. Ghaziabad
2. Gautam Buddh Nagar
3. Kanpur City
4. Auraiya