Final answer:
651,970 rounded to the nearest hundred thousand is 700,000 (A).
Step-by-step explanation:
To round 651,970 to the nearest hundred thousand, we need to look at the digit in the ten-thousands place, which is 9. If the digit is 0, 1, 2, 3, or 4, we round down. If the digit is 5, 6, 7, 8, or 9, we round up. In this case, since 9 is greater than 5, we round up to the next hundred thousand. Therefore, the answer is 700,000 (A).