What was one major weakness with the articles of confederation?

It created a too-weak national government.  

When Congress drafted the nation's first constitution in 1777, it knew that many Americans feared a powerful national government. For that reason, the proposed Articles of Confederation created a framework for a loose confederation of states. Within this alliance, each state would retain "sovereignty, freedom, and independence." Any power not specifically given to Congress was reserved for the states. This meant that each state could often develop its own policies.

In addition, the Articles did not set up an executive branch to carry out the laws or a judicial branch to settle legal questions.

so d is the answer

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.