Answer:
for the 1st
a.) differing ideas about land use and land ownership
Native Americans were really tense because the English colonists would chop down the trees and dig the earth, and they also thought that they were using their land, which the English settlers were obliviously.
for the 2nd
c.) competition between France and England for land and power.
If I'm not mistaken, the French and and Indian War was caused by both France and England; they both wanted to extend their colonies into the Ohio Territory