Answer:
first let's look at what "unconformity" means "An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous." -google.
So that would make the answer D, "Igneous rock forms between sedimentary layers."
(also, the fact you said "chile" compelled me to look it up and help you're hilarious)