The atmosphere at the 4C Challenge after the hacker's message plays on everyone's phones is:
C. panicked and upset
1. Panicked: The sudden appearance of the hacker's message can lead to confusion and fear among the participants. This unexpected event can cause a sense of urgency and anxiety, leading to a panicked atmosphere.
2. Upset: The content of the hacker's message could potentially be distressing or threatening, causing the participants to feel upset and unsettled. This emotional response can contribute to an overall atmosphere of unease and distress at the challenge.
Therefore, the atmosphere at the 4C Challenge is likely to be panicked and upset after the hacker's message plays on everyone's phones.
