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