In Region A of the IALA Buoyage System, when entering from seaward, the port side of a channel would be marked by a __________.

Correct Answer: Option B — red can buoy

In IALA Region A, the lateral system dictates that when entering from seaward, the port side of the channel is marked by red buoys. A can-shaped buoy is used to mark the port side, providing a distinct visual shape to assist in channel identification.