Which choice most logically completes the text? | Verbal SAT Question

In the early 19th century, ships in the British Royal Navy were ranked based on military strength. The system considered the number of a ship’s cannons and decks. “First-rate” was the highest ranking, and “sixth-rate” was the lowest ranking, followed by unranked ships. This ranking determined the size of a ship’s crew: first-rate ships had between 850 and 875 crewmen, while lower-ranked ships had fewer. Two of the ships in the British Royal Navy from this period were the Dreadnought (98 cannons and three decks) and the Royal George (120 cannons and three decks). Of these two, only the Royal George was ranked a first-rate ship. It can therefore be concluded that __________

Which choice most logically completes the text?

the Dreadnought had between 850 and 875 crewmen.

all ships with at least 98 cannons were ranked as first-rate ships.

the Royal George needed a crew larger than 875 people in order to operate efficiently.

not all ships with three decks were ranked as first-rate ships.