Answer:
it's C:to prevent the submarines to attack ships.
Explanation:
The convoy system, a group of ships sailing together for protection, was designed to help protect cargo in passenger ships during the First and Second World War. The system was created out of desperation. The modern convoy system is most associated with the First World War, but it has a much longer pedigree in history. During the colonization period of the Spanish Empire in Latin America, for instance, Spain employed convoys to protect its treasure ships against marauding pirates who targeted isolated ships. Traveling in groups provided protection to ward off isolated attacks.
WHAT IS A CONVOY?
a group of ships or vehicles traveling together, typically accompanied by armed troops, warships, or other vehicle
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