What serves as a good example of the notion that people were aware of some of the chemical processes involved in photography centuries before they were really developed. A. silver nitrate being discovered by albertus magnus in the 13th century

B. lernarodo da vinci using developer to produce real camera prints

C. the greek philosopher aritstotle writing lengthy essays about the processes of the photography

D. cave drawings that clearly depict modern day camera and photography processes

silver nitrate being discovered by Albertus Magnus in the 13th century

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.

its c not d   tell me if that´s correct