Grammar Test - who/whom

Test # who/whom

I have no idea ________ did it.

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    Weird Places On Earth

    Racetrack playa

    Located in one of the flattest places on the face of this planet are the strange and unexplained Sailing Stones of Racetrack Playa - Death Valley - California - USA. Once a year the Playa or flat desert pan experiences short winter rains and becomes slippery as the hexagonal desert floor turns back to mud. During this time the boulders and rocks move leaving clearly visible tracks behind them. Although scientists believe that high winds are responsible, some of the rocks will suddenly change directions and move at almost perfect right angles to their previous direction. All the evidence suggests that this is not a hoax although it is also said that the movement of these rocks has never been captured on film or video. In this technological age we wonder why time lapse photography hasnt been used?

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