(A) ** True
(B) False
EXPLANATIONS BELOW
Concept note-1: -2. There was 2, 490 kilometres of trench lines dug during the First World War.
Concept note-2: -It is estimated that there were about 2, 490 kilometre of trench lines dug during World War I.
Concept note-3: -The first trenches of the Western Front were dug along the Chemin des Dames and from there they would eventually stretch across Europe from the Swiss border to the North Sea. The Battle of the Aisne was fought in September 1914.
Concept note-4: -Trenches were common throughout the Western Front. Long, narrow trenches dug into the ground at the front, usually by the infantry soldiers who would occupy them for weeks at a time, were designed to protect World War I troops from machine-gun fire and artillery attack from the air.