Answer:
Option B , It opens more frequently in response to a given stimulus.
Explanation:
A gated channel is one which opens specifically to some kind of stimulus. These stimulus could be a neurotransmission, a variation or change in the pressure, voltage, lights, chemical environment or any other physical parameter.
For example
Ligand gated ion channel which have receptors forming a membrane ion channel to allow passage of specific chemicals such as Na+, K+, Ca++, or Cl− only after the activation of receptor/channel complex.
Hence, option B is correct
