A. Sailors keep uplook at sea.
B. Sailors keep outlook at sea.
C. Sailors keep lookout at sea.
D. Sailors keep lookup at sea.

A. The deck is divided into forecastle deck, main deck and poop deck.
B. The deck is divided into forecastle deck, lower deck and main deck.
C. The deck is divided into forecastle deck, main deck and lower deck.
D. The deck is divided into main deck, lower deck and poop deck.