The Answer is clearly D.salt.
“Chinese received 30-50 percent lower wages than whites for the same job and they had to pay for their own food stuffs,” Chang says. “They also had the most difficult and dangerous work, including tunneling and the use of explosives. There is also evidence they faced physical abuse at times from some supervisors.
Moral diplomacy was a major tool for the United States to pursue its economic interests abroad.
In the end, moral diplomacy increased the U.S.'s direct military action in many countries and also greatly impacted the economy by manipulating situations in countries that were not democratic or those that held what Wilson viewed as morally corrupt values.
their disagreement was over who the successor was