The correct answer is "Clover sees a man petting Mollie, but Mollie denies it."
In "Animal Farm" by George Orwell, Clover saw a man pet Mollie. Although Mollie denied it happened, Clover can sense she is lying, which causes her to go look into Mollie's stall.
This is because iambic pentameter generally has 10 syllables per line. So a quick trick to use when trying to determine if a line is iambic pentameter is to count the syllables.
