Answer:
give the passage so we can find the answer
The underlined phrase is this one:
"<span>fog rolling down the river"
The correct answer is this one: "Absolute Phrase." </span><span>Absolute phrases do not directly connect to or modify any specific word in the rest of the sentence; instead, they modify the entire sentence, adding information. </span>
Do you have more of an idea other than just ancient castles?