The difference between a compound sentence and complex sentence is that a compound sentence has two independent clauses (clauses that could stand alone) and a complex sentence has one independent clause and one dependent clause.
Fog rolling down the river is a form of figurative language known as personification. Personification occurs when a non-human object is given a human characteristic or action. In this case, fog cannot literally "roll" down the river. I mean, just imagine a person rolling down a hill like a derp-head. Fog doesn't do that, but in a figurative way, it "rolls" down the river. I hope you can understand :')
Example of a sentence that most needs to be revised because it's description is too vague is : we hike two miles uphill in the blooming forest.
Usually, you hike on the mountain not in the blooming forest.
hoep this helps
The answer is B
Explanation: personally I do not think any other option makes sense!