Mexico city is
the capital of mexico
the 4 capital of mexico
the largest city in north america
all of the above

Mexico city is the capital of the country of the same name: Mexico - so the first option is correct.

It is also the biggest city in North America - so the third option is also also correct. It's also one of the biggest cities in the world.

This means that the correct answer must be "all of the above"

2. is bettergo with that