______ country recently test-fired its most advanced nuclear-powered missile named, Bulavainter continental ballistic missile ?

(a) Japan
(b) Russia
(c) USA
(d) China

Exp:

Russia’s Knyaz Vladimir submarine of Borei-class vessel, test-fired its most advanced nuclear-powered missile named, Bulavaintercontinental ballistic missile which precisely hit the target range of 1000 km away in the Russian region of Kamchatka.