You Have Discovered a Previously Unidentified Plant, and You Cultivate

You have discovered a previously unidentified plant, and you cultivate it in your lab. You notice that its flowers close when people are talking, yet are open when the lab is relatively quiet. You suspect that this plant may have the ability to hear! Based on what you know about plant sensation, which of the following hypotheses is the most reasonable to explain this phenomenon?

A) There is a cell- surface receptor on root cells that becomes phosphorylated when the soil vibrates in response to sound waves.
B) There is a cell- surface protein on the epidermal cells that becomes phosphorylated in response to vibration by sound waves.
C) There are tiny hairs on epidermal cells that bend in response to the vibration of sound waves, triggering an action potential in epidermal cells.
D) All of the above answers are correct.