Final answer:
To round 67,834,519 to the nearest hundred thousand, we look at the digit in the hundred thousand place. Since the digit is 8 and the digit to the right of it is 3, we round down and change all digits to the right to 0, resulting in 67,800,000.
Step-by-step explanation:
In order to round 67,834,519 to the nearest hundred thousand, we need to look at the digit in the hundred thousand place, which is 8. If the digit in the tenth thousand place is 5 or greater, we round up. In this case, the digit is 3, so we leave the hundred thousand place as 8 and change all digits to the right to 0. Therefore, the answer is 67,800,000, which corresponds to option A.