A. He was sent by Spain to find a way around Africa and succeeded in finding a narrow passageway between two continents.
Answer: No it is a set.
Explanation: (Though Each number is an element of the set )
Hong cong ? at least I think
Trench warfare
Probably the most important was the introduction of high explosive shells, which dramatically increased the lethality of artillery over the 19th-century equivalents.
