Question: Lisa was hiking in a rocky area and in a rock, she saw what looked like footprints made by a bird. But weirdly, they were in a rock. Where did they come from?

  Options: 
 A. The footprints were originally in mud or peat, but after a lot of time, the substance had been changed into rock
 B. The rock was actually an asteroid
 C. a very heavy bird made imprints in the rock.
 D. a spaceship used a laser to make the etches in the rock
Answer: A