Answer: The answer is B: 3 Countries
Explanation: The three countries that have more speakers than the US are Columbia, Argentina, and Spain,
The sentence is in the second person singular (you). Therefore, the correct pronoun is tú.
Mis amigas leen mucho. A ellas les gusta la serie de Harry Potter.
Ellas because they're female, Ellos would mean they're male. Hope this helps :)
La primera opción es correcta.
Espero que te ayude!