What was the main battle tank of the Soviet Union at the time?

The Soviet Union used a lot of tanks during their war.

It was introduced after the Second World War. It was completed by Nizhny Tagil by the end of 1945. T-54 was the main tank for an armored unit for the Soviet Union armies and many others.

Option (A). Sevastopol is incorrect. Sevastopol was a port in the Crimea on the Black sea, the battle for control of Sevastopol was fought by the Axis powers of Germany and Romania against the Soviet Union. It was called the battle of Sevastopol or the defense of Sevastopol.

Option (C) is not correct. The Stalin tank(IS) was used by the Soviet Union during the second world war. The T-34 was the famous fast tank used during the second world war. It was developed in the U.S. by J. Walter Christie. It was combined with a very high power to weight ratio.