Civil liberties are the sorts of things guaranteed to American citizens in the Constitution's Bill of Rights. I realize that's confusing because it's called the "Bill of Rights" rather than "liberties." But they are certain liberties or freedoms that are guaranteed to all: Freedom of speech, freedom of assembly, freedom of religion, etc, along with basic rights like the right to a fair trial, the right to vote, etc. Civil liberties are viewed from the standpoint of all persons equally.
Civil rights pertain to each person's right to operate as an equal in society and not be discriminated against on the basis of race, gender, etc -- in a wider array of situations than just the liberties assured in the Bill of Rights. For example, the Constitution does not give every person the right to be accepted into college. (That's not a guaranteed civil liberty under the Constitution.) But if a college is shown to discriminate against you and deny your enrollment because of your race or gender or disability or some other factor, then they have violated your civil rights to equal treatment.
First off it wasn't just the 300 Spartans it was around 7 to 8 thousand strong army of allied Greek city states that battled at Thermopylae for about 7 to 8 days inflicting heavy physical and moral damage on the Persians however in the end King Leonidas ordered a full retreat because a local had betrayed them and told the Persians of a mountain pass that they could use to flank the Greeks, however King Leonidas and his rear guard of around 300 Spartans, 700 Thespians and 400 Thebans as well as an odd assortment of other troops stayed to halt the advance. In the end King Leonidas and his rear guard were slaughtered but they did buy enough time for the rest of the forces to fully retreat and King Leonidas death galvanized the rest of Sparta to rally with the other Greek city states to defeat the Persians.
I’m not sure what time period you are talking about, but the “last part” if the land for settlement you must be talking about the Native American land, the US government sold the land to settlers behind the the Native Americans back, and they sold even though they had a treaty and the Americans “gave” the land to the native Americans for reservations.
The answer to you question would be C.
hope this helps