Free trade can have various effects on the United States. The applicable options from your list are:
A. lower prices - Free trade generally leads to lower prices for consumers due to increased competition and access to lower-cost imports.
B. decreased wages - There can be downward pressure on wages in certain sectors, especially those that face competition from imports.
C. higher farm profits - In some cases, agricultural producers may benefit from access to larger markets and reduced tariffs.
F. increased consumer choice - Free trade typically increases the variety of goods available to consumers, as more products from different countries are available in the market.
Options D (less variety in businesses) and E (more low-skill jobs) do not accurately represent the general effects of free trade in the U.S. context, as free trade usually promotes greater variety in products and the market.
So, the correct selections are A, B, C, and F.