Which of the Following Reasons Explains Why Channels Are Required

Which of the following reasons explains why channels are required in membranes in order for neurons to perform their function?

A) Neurons have to function in reception (e.g. sensory) ; therefore, they must be able to switch channels in order to get the appropriate information.
B) The lipid bilayer is impermeable to ions and polar molecules, and ion flow through the membrane is essential for nervous transmission of information.
C) Channels permit the flow of water through the membrane, and water is necessary for hydrolysis reactions in the cytoplasm.
D) Channels are required in order to keep Ca²⁺ levels low inside the cytoplasm.