Answer:
Telephone and transcontinental telegraph.
Step-by-step explanation:
The other options are items that aided the agricultural industry.
Either of the items selected aid the business transactions because they allow the possibility of communication between people that lived at a long distance from each other. They also made the transactions faster as both systems connected long distances almost immediately.
In the case of the transcontinental telegraph, it served as the only method of near-instantaneous communication between the east and the west of the United States during the 1860s. Before that, all communications were made by post mail and the travel for one coast to the other last 110 days average.
I hope this answer helps you.