Select the word which means the same as the group of words underlined in the given sentence.
These glass windows are so old and one can’t even see through them, they need to be replaced.

The correct option is Opaque.

Explanation:
The underlined phrase "one can’t even see through them" describes a property of a material through which light cannot pass, rendering objects on the other side invisible.

Let's analyze the meanings of the given options:
1. Opaque: Not transparent; impossible to see through.
2. Dirty: Covered with dirt, dust, or grime.
3. Transparent: Allowing light to pass through so that objects behind can be distinctly seen.
4. Black: Of the darkest color, owing to the absence of or complete absorption of light.

Therefore, the word that means the same as the underlined group of words is Opaque.