Question: I found an impression of bird's feet in a rock
Choices:
text: monkeys carved the footprints into the rock
label: A
text: the rock is made of soft mud
label: B
text: a very heavy bird was walking on the rock
label: C
text: the substance that was walked in became hard after a very long time
label: D
Answer: D
Fact: An example of a fossil is a footprint in a rock