Based on the following sentence, what is the cause?

The window was opaque.

OPTIONS:
- The glass was stained.
- The blinds were open.
The glass was stained.
Vad är orsaken till detta, baserat på följande mening? Fönstret var ogenomskinligt. - Glaset var färgat. - Persiennerna var öppna.
What is the reason for this, based on the following sentence? The window was opaque. - The glass was colored. - The blinds were open.
Glaset var fläckat.
The glass was stained.