Introduction:
WiMAX stands for Worldwide Interoperability for Microwave Access, which is a wireless communication standard that provides broadband access over long distances. It operates on the IEEE 802.16 standard and can deliver high-speed internet access to a large number of users simultaneously. WiMAX is primarily used for providing internet connectivity in metropolitan areas.

Explanation:
1. Local Area Network (LAN):
- A local area network (LAN) is a network that connects devices within a limited area, such as a home, office, or campus.
- WiMAX can be used for LANs, but it is not the most common use case.
- LANs typically use wired connections like Ethernet or Wi-Fi for connecting devices together.

2. Personal Area Network (PAN):
- A personal area network (PAN) is a network used for connecting devices in close proximity, usually within a person's personal space.
- Examples of PAN technologies include Bluetooth and USB connections.
- WiMAX is not commonly used for PANs as it is designed to provide long-range connectivity.

3. Metropolitan Area Network (MAN):
- A metropolitan area network (MAN) is a network that connects devices within a city or metropolitan area.
- WiMAX is primarily used for MANs as it can provide wireless broadband access over a large area.
- It allows users to connect to the internet without the need for wired connections, making it suitable for urban environments.

Conclusion:
The correct answer is option B, which states that WiMAX is mostly used for metropolitan area networks (MANs). WiMAX provides wireless broadband access over a large area, making it suitable for connecting devices within a city or metropolitan area. It is not commonly used for local area networks (LANs) or personal area networks (PANs) as these typically use wired or short-range wireless technologies.