Answer:
The sentence that shows that Waverly practices caution is : "I climbed the sixteen steps to the door, advancing quietly up each so as not to make any warning sounds."
Step-by-step explanation:
Waverly tried to be silent and careful so she wouldn't be heard when she arrived.
She had been away from home for a long time and knew she would be in trouble if they heard her arrive at that time, so she tries to be as quiet as possible.