Answer : 1. " 14 "
Explanation :

1. Petroleum-producing areas in Rajasthan are spread over 14 districts.

2. Rajasthan has significant resource potential of hydrocarbons under 4 petroliferous basins.

3. Potentially due to hydrocarbons, 3 petroliferous basins of Rajasthan have been upgraded to Category-I i.e. Bombay High, Assam and Gujarat.