As of November 2021, the only country constructing “Nuclear-Powered Icebreaker” is ?

A. Sweden

B. Russia

C. Norway

D. United States

Detail: 

A nuclear-powered icebreaker is a nuclear-powered ship, purpose-built for use in waters covered with ice. While nuclear-powered icebreakers have been considered or planned by other countries, the only country that has built and operated them as of 2022 is Russia. Nuclear-powered icebreakers have been constructed by the Soviet Union and later Russia primarily to aid shipping along the Northern Sea Route in the frozen Arctic waterways north of Siberia. Nuclear-powered icebreakers are much more powerful than their diesel-powered counterparts, and although nuclear propulsion is expensive to install and maintain, very heavy fuel demands and limitations on range, compounded with the difficulty of refueling in the Arctic region, can make diesel vessels less practical and economical overall for these ice-breaking duties. During the winter, the ice along the Northern Sea Route varies in thickness from 1.2 to 2.0 metres (3.9 to 6.5 feet). The ice in central parts of the Arctic Ocean is on average 2.5 metres (8.2 ft) thick. Nuclear-powered icebreakers can force through this ice at speeds up to 10 knots (19 km/h, 12 mph). In ice-free waters, the maximum speed of the nuclear-powered icebreakers is as much as 21 knots (39 km/h, 24 mph).