Question

_____world wars were fought at the start of the twentieth centuries
a Two Three ② One.​

Answer 1

Explanation:

A world war is "a war engaged in by all or most of the principal nations of the world". The term is usually reserved to two major international conflicts that occurred during the 20th century: World War I (1914–1918) and World War II (1939–1945).

Answer 2

Explanation:

2 world wars fought at the start of 20th century