Where in this diagram would an earthquake's focus be located?

A. Underground, at the point where slippage aling the fault begins
B. At any point on Earth's surface where rock is deformed
C. On Earth's durfacem directly above the fault
D. About 70km below the fault, at sea level

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim