I believe the answer may be D. In taking action, one must not worry about success or failure.
I would say that the stirrup allowed for quicker mounting of the horse, and it may have caused horses to be used in battle more frequently.
Answer:
The Preamble states the six purposes of government: to form a more perfect union; establish justice; insure domestic tranquility; provide for the common defense; promote the general welfare; secure the blessings of liberty now and in the future.
