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The frequency of NFC (Near Field Communication) is 13.56 MHz. This specific frequency is part of the radio frequency range that NFC technology utilizes for communication between two devices when they are brought close together, generally within a few centimeters. The choice of 13.56 MHz is standardized, which allows for interoperability between different devices and manufacturers.

The other options relate to different technologies or specifications that are not applicable to NFC. For example, 2.5 Gbps and 160 Mbps are typical data transfer rates associated with high-speed networks, not the operational frequency of NFC communication. Lastly, 941 pin does not pertain to any relevant specification related to NFC frequency or operation. Thus, the frequency of NFC being 13.56 MHz is crucial for its function in applications like contactless payments and data exchange.