Answer:
I'd say B) Mexico and the United States.
Step-by-step explanation:
A list of our answer choices:
A) The United States and Romania
B) Mexico and the United States
C) South Africa and India
D) Mexico and Indonesia
A: It can't be the US and Romania because Romania has the least amount.
B: It's possible because the US has the most amount, and Mexico is the 4th highest. Plus, the US is right next to Mexico.
C: South Africa and India are wayyy down the list, so it's impossible.
D: Mexico and Indonesia are not possible because they are both too far from each other, and Indonesia's amount is not much.
Thus, the answer is A) The United States and Romania.