The answer is option A or "developed new methods of manufacturing." Eli Whitney's most known invention was the cotton gin, which was a machine that enabled to remove the seeds from the cotton in factors. Samuel Slater's most known invention was the cotton mill which turned the cotton into threads of fabric to be used for other purposes. Both of these inventors made huge impacts during the industrial revolution and two of the biggest names of that generation.
Wong-Woo was eventually allowed to enter because the Secretary of Labor overruled the denial. This suggests that Wong-Woo had a valid application for coming to the U.S.
