Hi!
Expanded form is when we multiply each of the digits by how many 0s they have.
So 253 is (2 x 100) + (5 x 10) + (3 x 1).
17,000
400
9
(17 x 10,000) + (4 x 100) + (9 x 1)
The answer is C) (17 x 10,000) + (4 x 100) + (9 x 1) (which equals 17,409)
Hope this helps! :)
-Peredhel