The answer is c. Muddy, rat-infested trenches
Deserts were not a common environment for trench warfare. Trench warfare is typically associated with World War I, which primarily took place in Europe, particularly on the Western Front.
Jungles were also not a common environment for trench warfare. While some conflicts have occurred in jungle environments, trench warfare is specifically linked to the conditions of the Western Front during World War I.
This is the correct answer. Trench warfare during World War I was characterized by soldiers living and fighting in long, narrow ditches dug into the ground. These trenches were often muddy, waterlogged, and infested with rats, creating extremely harsh and unsanitary living conditions.
Mountains were not a typical environment for trench warfare. While there were battles in mountainous regions during various wars, the iconic image of trench warfare is associated with the flat, muddy fields of the Western Front in World War I.