The Asian elephant walks with at least two, and sometimes three, feet on the ground at all times. Even though it can accelerate, it does so merely by taking quicker Asian elephant does not actually run.
What this question is testing
Argument
The author says: the Asian elephant always has at least two feet on the ground, so it doesn't actually run.
Evaluate
The argument is treating "having feet on the ground" as the disqualifier from running. For that to work, we need a definition of running that requires the opposite — having all feet off the ground at some moment.
Think of it this way. The author is implicitly using a definition: That's a real biological definition (it's how scientists distinguish running from fast walking). Add that, and the argument closes: elephant always has feet down -> elephant is never airborne -> elephant doesn't run.
Goal
The answer should give us this definition of running.
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