Read the following context and choose the best option to answer the question.
Context: The kids had a lot of fun today . When they awoke , they were thrilled to see that Daddy had returned from his trip . They also discovered the presents that he bought for them and hid in their room . Nick immediately started building his puzzles before Daddy and Mommy realized the boys were awake .
Question: What may be the reason for them not knowing he was awake ?
Options: 
A. He was being so quiet .
B. None of the above choices .
C. They forgot to set an alarm .
D. They overslept .


A