Final answer:
Open networks are indeed unencrypted, making it easy for someone to capture and view data being transmitted over such networks.
Step-by-step explanation:
The statement that open networks are unencrypted, making traffic easily sniffable is A. True. On open networks, data is transmitted without encryption, allowing anyone with the right tools to intercept and view that data. This is particularly dangerous on public Wi-Fi networks at places like coffee shops, airports, and hotels, where malicious users can easily use sniffing tools to capture sensitive data from unsuspecting users.