Question

this communication invention, improved during the industrial revolution, sped up business transactions and coordination across the u.s. what was this invention? radio telephone telegraph internet

Explanation:

The telegraph was improved during the Industrial Revolution and sped - up business transactions and coordination across the U.S. Radio and telephone came later in significant development stages compared to the telegraph's key role in the Industrial - Revolution business communication. The internet is a much more recent invention.

Answer:

C. telegraph