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Analyzing Development of Claims: Tutorial

Question:
Think about the words and details you noticed in the first paragraph of "Shoes: Feet First!":

"Walking has always been humans' primary means of travel. Early humans migrated from Africa to India, Asia, and eventually Europe and the Americas largely on foot. On July 20, 1969, astronaut Neil Armstrong took the next step in this migration by walking on the surface of the moon. Even today, the primary vehicle for millions of people worldwide is their own two feet."

What is the authors' claim in this paragraph?

A. Humans have made great achievements, such as walking on the moon.
B. Humans migrated from one continent to the next many years ago.
C. Humans have used walking as their main way of traveling for a long time.
D. Humans have been on the earth for a long time.