The sentence given will have Option C, steward as its correct answer.
The given sentence possesses the following nouns: the steward, passengers, deck and tide. Option B and D are deck and tide respectively, which are both neuter gender nouns. The former one means a place on the floor of the ship, wherein the passengers can stand and the latter means the formation of water waves by wind or other forces within water. Here, Option A, passengers is a common noun as both masculine and feminine entities can come within the arena of the same.
This leaves us with Option C, steward, which means a staff in the ship whose service is to help, and is a masculine noun. The feminine counterpart of the same is Stewardess.
Thus, Option C is the correct answer.