The hundreds of Indian peoples and tribes had many languages and ways of life
The best example among these of the influence of Athenian democracy on later governments is B. the representative democracy of the United States.
The US is today's country that tries to replicate Athenian democracy the most, so its influence is quite noticeable in its politics.
Harding signed Emergency Quota Act (answer B) in 1921 order to limit the number of immigrants in the United States. From his point of view it was necessary as after World War I many Europeans tried to find their homes in the USA.
B. because southern states had large populations of people, which would influence representation