Help LEGIT answers and braincells needed

Which is not a principal group in the Köppen system?

west coast climate

humid tropical climate

polar climate

dry climate​

How would i answer this for an exam?

Because its government strictly controls its economy, north korea has a economy. a. command b. mixed c. traditional d. free market

Which statements describe cultural influences? florida is bordered by water on three sides. french is spoken in parts of louisiana. forests are cleared to provide space for cattle grazing. male children are encouraged to attend the university. the longest river on the continent is located here. birthdays are celebrated on january 1st. per capita income of northern buckland is more than $100,000.