The correct option is
D 233,145 < 240,345 < 279,550
The money in their savings are 240,345 dollars, 233,145 dollars, and 279,550 dollars.
Let us place the values in a place value table.
Here, the hundred thousand place of all the numbers are the same. Hence, we have to compare the ten thousands place.
The digits in the ten thousands place are 4, 3, and 7.
Among these three numbers, the ascending order is: 3 < 4 < 7
Hence, the numbers in the ascending order is:
233,145, 240,345, 279,550