Answer:
Correct answer is A. enlightenment and civilization
Explanation:
Option A is correct as they believed that the regions they colonized were totally uncivilized and that they will bring civilization to them, with the ideas of enlightenment, which according to them they never had.
B is not correct as they were preventing rebellions.
C is not correct as they were not bringing liberty as they were actually taking it from them.
D is not correct as the economy that was strengthened was their own, not of their colonies.