Step 1: Overview of Oil-Producing Regions.
Ankleshwar is one of the major oil-producing regions in Gujarat, home to significant reserves of natural gas and oil.
Step 2: Analysis of options.
- (A) Rudrasagar: Rudrasagar is not located in Gujarat.
- (B) Naharkatiya: Naharkatiya is an oil-producing region in Assam, not Gujarat.
- (C) Ankleshwar: Ankleshwar is a major oil-producing region in Gujarat, known for its oil fields.
- (D) Digboi: Digboi is located in Assam, not Gujarat.
Step 3: Conclusion.
Ankleshwar is the correct oil-producing region located in Gujarat, so the correct answer is (C) Ankleshwar.