Option a is the correct answer. Ochre-coloured Pottery (O.C.P.) was christened at Hastinapur because it was there that it was first recognized and defined as a distinct cultural phenomenon by B.B. Lal. Ochre-colored Pottery (O.C.P.) was a type of pottery that was used by a Bronze Age culture in the Indo-Gangetic Plain, generally dated between 2000 and 1500 BCE. It was named so because of its distinctive ochre colour, which was probably due to the use of iron oxide in the clay or the firing process. O.C.P. was sometimes decorated with black painted bands and incised patterns, and was often found in association with copper hoards, which were collections of copper weapons and other artifacts.