Answer:
The third graph.
Step-by-step explanation:
Before practice, the jug was empty. This means it starts at 0. Ray fills the jug up; this will be the graph increasing, starting at 0, until the jug was filled.
The jug stays at the same level during practice; this means the graph will be constant during this time.
Halfway through practice the players drink from the jug. During this time the graph will be decreasing.
Ray then fills the jug back up; this means the graph will increase.
During the rest of practice, the jug stays at the same level; the graph will be constant during this time.
After practice Ray drains the jug. This means the graph will decrease during this time.
