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:
0. He was being so quiet .
1. None of the above choices .
2. They forgot to set an alarm .
3. They overslept .
Answer: 0