The correct options are
B Under his leadership, the USSR defeated the German troops in the Battle of Stalingrad.
C Yuri Gagarin became the first astronaut to travel to space.
D The USSR became the first country in humankind to launch a satellite into space.
The power baton got passed on to Joseph Stalin, and he became the President of the USSR after Lenin's demise. Joseph Stalin introduced the Five Year Plan. It was an economic policy that laid the objectives and goals for USSR to be achieved for the forthcoming five years. It was from here that India adopted the concept of the Five Year Plan. The USSR made significant achievements with the help of socialist policies. The USSR was the first country to launch a satellite in the history of humankind. Yuri Gagarin became the first astronaut to travel to space. The USSR under the leadership of Joseph Stalin defeated Germany in the Second World War.