According to the article, what caused leaders to speed up the space race in the early 1960s? A. Vostok / had

According to the article, what caused leaders to speed up the space race in the early 1960s?

A. Vostok / had orbited Earth and returned safely. B. Ranger 6 had taken the first close-up pictures of the moon. C. NASA had developed a fireproof material to protect astronauts. D. The U. S. had landed a man on the moon.​

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