Which of the following environmental stimulus causes roots to grow away from itself?
Light
Plants respond to environmental stimuli by growing in a specific direction, and these directional growth responses are called tropisms. Roots show positive geotropism (they grow towards gravity, into the soil) and negative phototropism (they grow away from light).
So among the given stimuli, light is the one that causes roots to grow away from it. Water actually attracts roots (positive hydrotropism), gravity attracts roots (positive geotropism), and air does not cause a strong directional response in roots.
Hence, the answer is Light.
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