Jacob riis wrote an important book, that brought attention to the problems in american cities. his book was called "how the other lives."

the answer is: How the other HALF Lives

"How the other half Lives" Highlight the life of poor people that exist in the early industrialization era. Due to large number of migrations to the cities, many of them unable to compete to found the jobs in factories. These people were forced to live in a slum (one room could be resided with more than 10 families) and that places have very poor sanitary.

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.

answer; i believe that the correct answer is (behavioristic)good luck