The correct option is D Overthrust fold
Nappe or thrust sheet is a large sheet-like body of rock that has been moved more than 2 km or 5 km above a thrust fault from its original position. Nappe occurs in overthrust fold. Overthrust Nappes are believed to be caused by transverse horizontal compression that occurs in geosynclinal systems and gravitational creep of the rocks that make up the mountain structures that have arisen from the geosynclines.