Answer; 3
During World War I, developments in military technology led to the use of poisonous and submarine attacks.
Step-by-step explanation;
The major impact of technology on World War I (WWI) was that it made the war much more difficult for the infantry soldiers who did most of the fighting. The new technologies led to trench warfare and the lack of new tactics led to massive slaughter at the hands of the new technology. These new technologies includes, the use of trench warfare, Poisonous gas, tanks, submarines, and command and control among others.