a. Alexei Leonov
b. Fyodor Gorbachov
c. Joseph Huston
d. Mark Elliot
Alexey Leonov was the first astronaut who did a spacewalk for the first time in the world. Alexey Leonov of the Soviet Union has died in Russia at the age of 85 years recently. On 18 March 1965, he took a spacewalk for 12 minutes in the space.