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A two-step progression in a master key system refers to a design where the keying system is structured so that the master key operates in increments of two levels. This means that each master key can control multiple locks in a controlled and hierarchical manner, allowing for greater flexibility and security.

In this setup, as you progress through the levels of keys, each subsequent key operates two steps higher than the previous one. This systematic design facilitates the creation of complex keying arrangements, where certain keys can open specific locks while others can manage broader access. This organized approach reduces the chance of unauthorized access while allowing for efficient management of access credentials.

Other options do not capture the essence of what a two-step progression entails. For example, a system with one key for two locks suggests simplicity and a lack of hierarchy, while a method to immediately open all locks implies unrestricted access, which is contrary to the purpose of a master key system. Similarly, a key duplication process focuses on replication rather than the structured access that defines a two-step progression. Hence, the identification of option B as representative of a two-step progression is warranted based on its structured approach in managing access levels.