Trench warfare led to stalemates during World War I by making it O difficult for attacks to succeed.
O easy to attack the enemy.
O difficult for soldiers to fight
O easy for soldiers to fight

A. It makes it difficult for attacks to succeed.

Explanation:

This is what I put down on my question, it also makes sense since they used the trench for protection against attacks.

the influence of daoism, buddhism, and legalism on chinese culture. unlike confucianism, daoism looked to nature rather than human beings as the source of morality. according to laozi, human society has to conform to the dao (the way), or the essential unifying element of all that is. some interpret dao as nature.