Which company carries the construction of submarines, missile-boats and destroyers and so on for the India navy and offshore supply vessels and well-head platforms and so on?

Answer: Option A

Mazgaon Dock Limited (MDL) company carries the construction of submarines, missile-boats and destroyers and so on for the India navy and offshore supply vessels and well-head platforms and so on. It manufactures warships and submarines for the Indian Navy and offshore platforms and associated support vessels for offshore oil drilling.