This is a bit subjective, but it could be argued that social change had the biggest change in Southern life, since the abolition os slavery (which was inherently a social issue) led to the biggest changes.
In 1907, Britain, France and Russia formed a military alliance for WWI, known as the Triple Entente.
The correct answer is D. unfamiliar with the geography and terrain.
The Continental Army, lead by George Washington, squared off with the British army during the American Revolution. During this time, the colonists were extremely unorganized, had little supplies, and was staffed by thousands of volunteers.
However the Continental Army did have an advantage in knowing the geography/climate. Considering the volunteer soldiers for the Continental Army lived in the 13 colonies (where the fighting took place) the geography and terrain was very familiar to them.