The best and most correct answer among the choices provided by your question is the third choice or letter C which states that " a Venus Flytrap snapping shut in response to touch."
Nastic movements are non-directional responses to stimuli (e.g. temperature, humidity, light irradiance), and are usually associated with plants. The movement can be due to changes in turgor or changes in growth (therefore K+ ion concentration usually controls such movement in plants).
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