Why does the battle of agincourt mark the death of chivalry?

Because a lot of people died in the battle I think

The Battle of Agincourt was first started with English archers. It was finally won when men with lead- weighted hammers, poleaxes, mauls and falcon-beaks joined in. It was fought on a field-knee deep mud and it was more of a massacre than a battle.

The answer b is correct this all occurred during the red scare