The appreciation of the US dollar would be most directly caused by an increase in tourism to the US. When more foreign tourists come to the US, they need to exchange their currency for US dollars, increasing the demand for the dollar and leading to its appreciation.
Conversely, an increase in US foreign investment in other nations would typically lead to a decrease in demand for the dollar, as US investors would be converting dollars to foreign currencies. An increase in US production of domestic agriculture could have various effects but does not directly lead to dollar appreciation. An increase in imports into the US would usually lead to a stronger demand for foreign currencies, leading to potential depreciation of the dollar.
Therefore, the correct response is:
an increase in tourism to the US.
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