Question

one part of the space race involved competition to be the first country to
develop the worlds fastest railroad.
turn unproductive farm lands into fertile fields.
build the worlds most powerful weapons.
achieve a lunar landing.

Explanation:

The Space Race was a Cold War competition between the U.S. and Soviet Union focused on space exploration milestones. A key goal was being the first to land humans on the Moon, which the U.S. achieved in 1969. The other options are unrelated to space-focused competition.

Answer:

achieve a lunar landing.