World War I killed more people (9 million combatants and 5 million civilians) and cost more money ($186 billion in direct costs and another $151 billion in indirect costs) than any previous war in history
I hope that this helps you
The answer is : The crusades.
The Crusades were a series of religious wars between Christians and Muslims started primarily to secure control of holy sites considered sacred by both groups. In all, eight major Crusade expeditions — varying in size, strength and degree of success — occurred between 1096 and 1291.
What is urgent there's nothing to answer?
The correct answer is C) Economics.
The study of how people satisfy unlimited wants with limited resources is called Economics.
Economics studies the production, distribution, and how people consume products and services in a determined market. Economics based its studies on the belief that resources are limited but people in a society have many wishes, desires, wants, and needs. So Economics studies all the factors involved in the process of getting raw materials and natural resources, fabrication, supply, delivery and the prices people pay to get something they want or need.
