Answer:
B) The rain rushed like a river down the tent's sides, and we heard a lovely song from a wren in a tree.
Explanation:
The sentence that would add a vivid description to the narration is that the " the rain rushed like a river down the tent's sides, and we heard a lovely song from a wren in a tree."
Vivid words are very descriptive and they provide a detailed insight into a narration. They are used to represent lucid and chimerical details in a better way.
We can see that the second option provides us with a depth of narration from all the elements used.
The rush of the river and the description of the song type by the specific bird in the tree furnishes our imagination with details of this trip event.