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Gear A is the driving gear. If all the teeth are shot off of Gear B, which gears will turn?

  1. Gear A only

  2. Gear A and C

  3. Gear A and D

  4. None of the gears

The correct answer is: Gear A only

If all the teeth are shot off of Gear B, it means that Gear B cannot turn and will not be able to drive any other gears. Only Gear A, as the driving gear, will still be able to turn and drive any gears connected to it. Gear C and D will not be affected as they are not connected to Gear B and do not rely on it to turn. Option A is the correct answer.