The study of this is psychology and you basically just go off of your experience. But, there is not any actual way to read the mind yet discovered by our technology.
Answer:
British development of tanks rejected by army in feb 1915
The three G's, God, Glory, and Gold. They could spread their beliefs and society (God) to whomever they encountered, making them "less savage," they would gain glory just for conquering new lands and expanding their empires, and they could achieve riches by taking the lands they found for their own personal use and resource collection.
C) forcing debate on policy alternatives