Step 1: Understanding the Concept:
According to FAO and international standards, fishing gears are classified into distinct structural groups based on how they capture fish.
Step 2: Detailed Explanation:
A cast net is a circular net with weights distributed along its margin, which is thrown (cast) by hand over a shallow water area.
As it is cast, it opens wide and falls through the water column, covering the fish and trapping them underneath against the bottom as the weighted perimeter sinks.
Therefore, under international classifications, cast nets belong to the group of falling gear (gears thrown from above to cover the target).
Step 3: Final Answer:
Cast nets are classified under Falling gear, which corresponds to option (B).