Answer:
d. New weapons required armies to rework plans of attack.
Explanation:
The new weapons as techology developed required new plans for attack and defense, as well as new tactics and strategies developed. We can mention: reconnaisssance by air, new artillery techniques, the use of poison gas, cars that turned into tanks and the use of radio and telephone to expand communicating lines.
A formation of increased and more rationalization to improve armies was needed, the training of soldiers and generals was accelerated. New weapons needed to be produced by the industries. Society and economies developed to a total war effort.
The so called wars of attrition then took by suprise many aspects that needed to be overseek as the traditional war tactics rendered unsustainable.
With expanded armies, greater allianaces took place and tensions escalated the way wars were fought in global scale.
