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What is the correct possessive form of the bold words if they are showing joint ownership?
Formed, in part, from the Rio Grande, the United States and Mexicos border stretches 1,900 miles long.
A)United States' and Mexico's
B)United States and Mexico's
C)United States's and Mexico's
D)United State's and Mexico's

Respuesta :

Answer:

B.

Explanation:

When you describe a plural noun's possession, you add ' after the plural noun, e.g. my grandparents' house, BUT when the nouns are showing joint possession, only the second noun has to be possessive, e.g. United States and Mexico's border.

Hope this helps!