Why were tanks developed during World War I?
A As a response to the stalemate caused by trench warfare
B As a response to the United States' entry into the war
C As a response to the development of military aircraft
D As a response to the dangers of chemical weapons
A As a response to the stalemate caused by trench warfare
Tanks were developed during World War I in an effort to break the stalemate of trench warfare by providing a new method of attacking enemy trenches. They were designed to cross difficult terrain, such as barbed wire, trenches, and shell craters, and to provide cover for advancing infantry. The first tank, the British Mark I, was introduced in 1916 and played a key role in several battles on the Western Front.