VCC (Pin 16): This is the positive power supply voltage pin. It supplies power to the IC for its operation.

C (Pin 9): Generally, the designation "C" might be referring to a control or configuration pin in some contexts, but for the CD4051BE, Pin 9 is actually the common output/input (COM) in demultiplexing/multiplexing configurations.

CHANNELS_IN/OUT6 (Pin 2), CHANNEL_IN/OUT0 (Pin 13), CHANNEL_IN/OUT3 (Pin 12), CHANNEL_IN/OUT2 (Pin 15), CHANNEL_IN/OUT7 (Pin 4), CHANNELS_IN/OUT4 (Pin 1), CHANNEL_IN/OUT1 (Pin 14), CHANNEL_IN/OUT5 (Pin 5): These pins are the data input/output channels. In a multiplexer configuration, one of these channels is connected to the common port (COM) based on the binary code applied to the selection inputs. In a demultiplexer configuration, the signal at the common port is routed to one of these outputs based on the selection input.

COMOUT/IN (Pin 3): This serves as the common port for input in the case of multiplexing and output in the case of demultiplexing.

INH (Pin 6): This is the inhibit pin. When high, it disables all channels from connecting to the common port, effectively disconnecting the common port from all channels.

VSS (Pin 8): This is the ground or negative supply voltage pin. It's connected to the ground of your circuit.

B (Pin 10), A (Pin 11): These pins, along with another selection pin not explicitly listed here but typically referred to as "S" or "C" (not to be confused with your usage of "C" for pin 9), form the selection inputs that determine which channel is connected to the common port. These are binary inputs that provide a three-bit binary code in multiplexer and demultiplexer applications.

VEE (Pin 7): This is the negative voltage supply pin. In some applications, this pin can be used to supply a negative voltage if needed by the IC for its operation.