Logical Reasoning

PT10 · S1 · Q15 A favored theory to explain

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A favored theory to explain the extinction of dinosaurs, together with many other species, has been the globally catastrophic collision of a large asteroid with the Earth.

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

15.

The new theory assumes that

  1. Correct

    the massive volcanic activity was

    Why this is right

    Answer A is correct.

    Skill tested: Necessary Assumption · how this choice captures the argument's function is the move to repeat next time.

    90% picked this

  2. no individual dinosaurs survived the

    Trap

    2% picked this

  3. the extinctions took place over

    Trap

    2% picked this

  4. other volcanic eruptions were not

    Trap

    3% picked this

  5. it is not possible to

    Trap

    3% picked this

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