Which of the following is a sound argument?
"if the moon is made of cheese, then donald trump is the president of mexico. the moon is made of cheese. therefore, donald trump is the president of mexico."
"either turkey is a country or new york is a country. new york is not a country. so turkey must be a country."
"i have seen millions of black crows. therefore, all crows must be black."
"if the earth is flat, then ted cruz is the president of the united states. the earth is not flat. therefore, ted cruz is not the president of the united states."