Answer: Option D
:
D
To round off a number to the nearest 100 we check the last two digits of the number.
If thisnumber is 50 or more, we round up the number to the higher value (nearest higher multiple of 100).
If this number is less than 50, we round down the number to the lower value.( nearest lower multiple of 100)
For 677, 70 > 50. So it is rounded off to 700.
For 833, 30 < 50. So it is rounded off to 800.

So, the given numbers are rounded to 700 and 800.
$\therefore$ Product = $700\times 800$
= 560000