-Law protecting private property -Economic competition
-Limited government regulations
-Consumer choice

These characteristics are featured of-

A. trade agreements with forgein powers
B. a free enterprise system
C. the federal banking system
D. the gold standard

Free enterprise system

Explanation:

Free enterprise requires a legal framework that recognizes and protects the private ownership of property—the right to create it, the right to use it, the right to trade it away—so long as in doing so, the private owner does not infringe on the equal rights of other property owners

Free enterprise system is surely correct

Explanation:

answer; (a) he was a u.s senator for 38 years;

the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.