Your answer is "Letter B, Religious differences increased rivalries between nations".
The birth rate increased to women having around 4 children in their lifetime. There were about 36 births per 1000 population per year
<span>Trench warfare is a type of land warfare using occupied fighting lines consisting largely of trenches, in which troops are significantly protected from the enemy's small arms fire and are substantially sheltered from artillery. The most famous use oftrench warfare is the Western Front in World War I.</span>
