I want to know the answer to the following question:
In 1874 the telegraph was known as the what of commerce?
All the background I'm provided with is that "When Bell mentioned to Gardiner Hubbard and Thomas Sanders that he was working on a method of sending multiple tones on a telegraph wire using a multi-reed device, the two wealthy patrons began to financially support Bell's experiments.". Is that enough to answer the question?
Answer: no