I'm somewhat confused at this question, but will give my best to answer it.
Spartan soldiers helped save retreating members of the Greek army:
against a force of three hundred Persian troops - this surely is false, as there never was a three hundred strong Persian force.
against the strength of the Athenian navy - this doesn't make much sense either, as the Athenian navy was Greek, so there's no reason for Spartan soldiers to defend greeks against the Athenian navy.
at the Battle of Marathon - the Spartans were not involved in this battle as they were celebrating a religious festival at the time.
The most likely answer is therefore at the Battle of Thermopylae, where a small Spartan contingent of soldiers stayed to defend the frontiers of their borders in order to enable the rest of the army that was with them at the time, to retreat.
Being a sharecropper or raising cotton in 1875 in Mississippi is exhausting, demeaning and destroys personal initiative. Being a share cropper might mean that you will have a little something left over for yourself if you have a very good crop. But without good crops, you will have nothing. My family and I work in the fields from sun up to sundown. We don’t own the land we work on. Our owner lets us grow crops on his land and takes a percentage of any profit. Sometimes we make enough money to have enough to eat and clothe ourselves. But it is more often that we just barely scrimp by. We eat what we can grow and on occasion, we can kill a chicken that we have raised. It is not a life you would wish on anyone.
The name that given is Muckrakers
The term was popularly coined during the development of early progressive era in the period of 1890s - 1920s.
Back then, the government and the establishments were known to be really corrupt and many Muckrakers started to do investigative journalism to find out the truth about their practice.
The correct answer is the fourth one.
Hoovervilles were shantytowns which appeared during the great depression for unemployed people who were evicted from their homes.
The term "Hooverville" comes from the president in turn during this economic crisis Herbert Hoover, who was therefore widely blamed for it.
as the depression worsened, hundreds of thousands of people settled in hoovervilles, mainly at the skirts of big cities during the decade from 1930 to 1940
In 1932 president Hoover lost the election to Frankling Roosevelt whose new administration helped lift US out of the great depression. Hoovervilles were eventually torn down in the early 1940´s
The statement that describes the Cuban missile crisis correctly is that Kennedy and Khrushchev agreed to remove missiles from both Cuba and Turkey. The correct option among all the options that are given in the question is the first option or option "A'. I hope the answer helps you.