The correct answer is option A. nastic response.
The nastic response are the responses, which are non directional to the stimuli. Here, the term non directional depicts that it does not matter, in which direction the stimuli is present, the response would be in particular direction. In this case, it does not matter from where a person touch the leaves, whether it is from upside, downside, right or left, the leaves would always move inwards to protect themselves.
