Question

He could see the river like the silver track/Left by a snail, and roads as narrow as ribbons.

Answer 1

Simile! Remember that similes always use "like" or "as".
Example: "As crazy as a fox" or "Sweet like candy"

Answer 2

Answer: B) Simile.

Explanation: A simile is a direct comparison between elements that aren't obviously related, it helps the reader to form a mental image and to understand a point. In the given lines we can see two examples of simile, the first one is "the river like the silver track left by a snail" which compares the river with the track left by a snail, and the second one is "and roads as narrow as ribbons" which compares the road with ribbons.