Question

the motion to adjourn
omay be proposed when another member has the floor.
omust be seconded.
ois debatable.
ois amendable.

Explanation:

In parliamentary procedure, a motion to adjourn is a privileged motion. It cannot be proposed when another member has the floor. It must be seconded to be considered. It is not debatable or amendable as it is a basic way to end a meeting.

Answer:

must be seconded.