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A password manager is a tool designed specifically to help users securely store and manage their passwords and other sensitive information. The primary functions of a password manager include generating strong and unique passwords for different accounts, which helps improve security by avoiding the use of easy-to-guess passwords or the reuse of passwords across multiple sites. Additionally, it securely stores these passwords in an encrypted format, allowing users to access them through a master password or authentication method.

This makes option B the correct answer, as it encompasses both the storage and generation aspects of secure passwords. The other choices do not accurately reflect the main purpose of a password manager. For instance, while encrypting computer files is important for data security, it is not the primary function of a password manager. Similarly, removing malware or backing up data to cloud storage are tasks performed by different types of software and do not relate to the key functions of a password manager.