Final answer:
The Lighted green buoy may have an even number as it is used to mark the starboard side of a channel when returning from sea.
Step-by-step explanation:
Among the buoys listed, the one that may be even numbered is the Lighted green buoy. This type of buoy is used to mark the starboard (right) side of a channel when returning from sea. The buoys are numbered in a sequence, with even numbers assigned to starboard markers and odd numbers assigned to port (left) markers. Therefore, a lighted green buoy could have an even number.