Preston, Alex and George recently purchased a house together, and each person bought his own insurance policy on the house. Preston bought $200,000 of coverage. Alex bought $200,000 of coverage, and George bought $100,000 of coverage. The day after they purchased their insurance policies, George's stereo shorted out and started a fire. The resulting damage totaled $40,000. How much of the loss did George's insurance company pay, assuming that all three policies contained pro-rata clauses?

a. $8,000

b. $16,000

c. $24,000

d. $40,000