Questions are based on the following image.
Indian infantry in the trenches at Fauquissart, France, 1915 
-Which new technological development MOST led to the utilization of trench warfare?
Definitions:
Mere Exposure Effect
A psychological phenomenon whereby individuals develop a preference for things merely because they are familiar with them.
Conscious System
Refers to the aspect of the human mind that is aware of self, the environment, and one's own thoughts, feelings, and experiences.
Abstract Categories
Conceptual groups or classifications that do not rely on physical properties but rather on shared qualities or ideas.
Age 2 1/2
A developmental stage in early childhood characterized by rapid changes in physical, cognitive, and social capabilities.
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