B. Horses. I doubt they'd kill their own mounts unless they had to.
By convincing others to support the industry duh
The answer would be the leather product industry. During the period of 1879 to 1909, there was a rise in less expensive products overall. So it happened to the iron and steel industry which rose because it had just become cheaper to manufacture at high quantities; but what increased its presence in the economic field, was the cotton industry, that was rising quickly, which made the leather products, that were more costly and time-consuming to manufacture to fall three rankings from 1879 to 1909.