During world war i, the arrival of american troops boosted allied morale because they. a)refused to join to battle at the meuse-argonne.. b)provided more than one million reinforcements.. c)taught allied troops how to build trenches.. d)forced german troops to evacuate france and belgium.

B) provided more than one million reinforcements.

Americans arrived at a rate of 10,000 a day, and provided more than one million reinforcements. They were greeted enthusiastically by the tired Allied armies. The Americans were particularly important in the battles of Cantigny, Chateau-Theirry and Belleau Wood. The infusion of fresh troops strengthened the Allies' position and boosted morale.

the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.