who opened for trade and settlement by virginians and pennsylvanians A. the french B. the native americans

A. the French

Explanation:

This situation occurred during the French and Indian war. The fought actually occurred between France and Great Britain, but both sides were supported by some Native American tribes.

The cause of the fight was an issue when determining the owners of  upper Ohio River valley. The French argued that the part of the river was belonged to them because controlling that part of the river will opened up a path for trades to Virginia and Pennsylvania, Gaining this will resulted in great economic benefits for whoever own that part of the river.

c. troops marched forward in close formation against newer, more accurate weapons