Final answer:
The signal word from this excerpt that shows an opinion is the word A. neat.
Step-by-step explanation:
An opinion is a statement that reflects a person's beliefs, feelings, or thoughts about a particular subject. The excerpt from 'On Becoming An Inventor' by Dean Kamen discusses the impact of inventors and entrepreneurs on industrialization. Signal words are words that indicate to the reader the writer's intention.
It mentions how inventors like Elias Howe and Cyrus McCormick created new inventions, such as the sewing machine and the reaper, which contributed to the growth of industry and agriculture. Entrepreneurs like Chauncey Jerome also played a role in finding new markets for their products. All of these examples highlight the importance of entrepreneurship and innovation in driving economic progress.