Which of these best explains the presence of the united states in china at the start of the 20th century?
a) the u. s. had nationalists defeat the communists there.
b) the u. s. wanted to ally with china to stop the spread of japan.
c) the u. s. had won pacific territories in the spanish-american war.
d) the u. s. needed to secure trade with china for industrial resources.

D)The U.S. needed to secure trade with China for industrial resources.

Explanation: This is the reason why we had manifest destiny that helped us expand our land towards the west coast like California to secure a better trade across the pacific ocean to china.

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explanation:

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.