in october of 1957, the soviet union shocked the united states by refusing to build missiles. testing the…

in october of 1957, the soviet union shocked the united states by refusing to build missiles. testing the first hydrogen bomb. increasing their defense spending. launching the satellite sputnik i.

in october of 1957, the soviet union shocked the united states by refusing to build missiles. testing the first hydrogen bomb. increasing their defense spending. launching the satellite sputnik i.

Answer

Brief Explanations:

In October 1957, the Soviet - Union launched Sputnik I, the world's first artificial satellite, which shocked the United States during the Cold - War space race. The other options are incorrect as they do not match the event of that time.

Answer:

D. launching the satellite Sputnik I.