As the First Crusade began, Pope Urban II promised the people that A. the sins of anyone killed on the Crusade would instantly be forgiven.
B. those who fought well would be given a title.
C. all crusaders would be well paid.
D. no one who participated in the Crusade would be killed.

The sins of anyone killed on the Crusade would instantly be forgiven.

Explanation:

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

i think it would be reparing roads