Here's why:
* Sordid means morally low, vile, or dishonorable.
* Ignoble means lacking nobility in character or purpose; mean.
The other words have different meanings:
* A) Maze and E) Labyrinth refer to a complex structure with many paths.
* B) Network refers to a system of interconnected things.
* C) Perplexity and F) Bewilderment refer to confusion or uncertainty.