The oil-gas fields Dighboi, Naharkatiya and Moran are located in:

Answer: Option A

Naharkatia (also spelled as Naharkatia or Nahorkatiya) is a town and a town area committee in Dibrugarh district in the Indian state of Assam. It is well known for petroleum and gas reserves. Earlier, Duliajan, the head office town of Oil India Limited was in its circle. However, the towns are close, within a 30-minute journey.