The Table Shows Individual Demand Schedules for a Market

The table shows individual demand schedules for a market. What can be said of Betty and Barney's demands for this good?

A) Both of their demands follow the law of demand.
B) Barney's demand follows the law of demand, but Betty's does not.
C) Betty's demand follows the law of demand, but Barney's does not.
D) Neither of their demands follows the law of demand.