What is the meaning of horizons as it is used in Paragraph 4 of the Space Shuttle Challenger text?

Paragraph 4: And I want to say something to the schoolchildren of America who were watching the live coverage of the shuttle's takeoff. I know it is hard to understand, but sometimes painful things like this happen. It’s all part of the process of exploration and discovery. It’s all part of taking a chance and expanding man's horizons. The future doesn’t belong to the fainthearted; it belongs to the brave. The Challenger crew was pulling us into the future, and we'll continue to follow them.

Question 2 options:

A)

career options


B)

experimental space weapons


C)

limits of possibility or knowledge


D)

lines which the sky and the earth’s surface appear to meet



Answer :

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