How did steel production change between 1880
and 1910? why do you think industrialized countries begin to measure their
success by their steel output?

with my knoladg i would say it was c

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

i believe your answer is d)