put it into good working order and made it available. For he told Robert to try it in his new locomotive. What does the excerpt add to the reader's synthesis about Stephenson's invention? O A. Stephenson put improvements in place that would double the speed of his first engine. O B. Stephenson was adept at taking other's ideas and putting them to practical use. The key to developing successful steam engines came in establishing partnerships. OD. Various mechanics had been working for a long time to perfect high-pressure steam engines.​