Which of the following algorithms uses a key size of 128 bits?

The choice indicating that all of the listed algorithms use a key size of 128 bits is correct. Each of the algorithms mentioned in the options supports a key size of 128 bits among other key lengths.

Chaskey is a lightweight authenticated encryption scheme that is designed to work with 128-bit keys. It efficiently provides both confidentiality and authenticity, making it suitable for various applications, especially in resource-constrained environments.

RC6 is a block cipher that supports key sizes of 128, 192, and 256 bits, but it commonly utilizes a 128-bit key for many applications, highlighting its flexibility while maintaining security.

Misty1 is another algorithm which supports a key length of 128 bits along with other sizes. It is a block cipher that is designed for efficiency in both hardware and software implementations.

Hence, since all the specified algorithms can utilize a key size of 128 bits, the response reflects the characteristics of each algorithm accurately. This underscores the versatility and adaptability of these cryptographic methods in various contexts.