Judging from sources b and c what was it like for the average soldier in the trenches

Before the battle began, usually soldiers are made to do several repetitive things, such as Stand downs-get ready for the attack; Breakfast and Weapon cleaning, Inspection, and Chores.
After the battle, the trenches became a nightmare. Since a lot of dead soldiers lying on the trenches, the smell was really unbearable and the whole place always invested with rats

The correct answer is - sp hybridization.

Explanation:

The molecular structure line with a carbon bound to the hydrogen with the single sigma bond and with 2 pi bond and one single sigma bond with carbon Nitrogen triple covalent bond.

To calculate the hybridization of an element like carbon by adding the sigma bond and the lone pair of that atom as here in  HCN molecule, zero lone electrons and two sigmas bond the C atom includes sp-hybridized orbital.