Intermediate Mathematical Challenge 2024 Q8

$\small\text{A}\,\,\,$ $10 \, 800$

$\small\text{B}\,\,\,$ $100 \, 800$

$\small\text{C}\,\,\,$ $999 \, 000$

$\small\text{D}\,\,\,$ $999 \, 999$

$\small\text{E}\,\,\,$ $1 \, 000 \, 998$