The correct answers are C. prototype and D. piloted.

Explanation
- Logic: The sentence describes a "controlled environment" used to test "unproven management strategies" before they are rolled out across the entire company.
- Blank (i): The subsidiary acts as a trial model or testing ground for the larger corporation. A prototype is a first or preliminary model from which other forms are copied or developed, making it a perfect fit. (Bellwether means an indicator of trends, and lodestar means a guiding star or principle; neither captures the concept of a functional, physical testing ground).
- Blank (ii): In this controlled environment, these unproven strategies are tested out. To be piloted means to be tested as a trial before being introduced more widely, which perfectly aligns with the clue "slated for company-wide rollout." (Promulgated means put into effect or made widely known, which contradicts the idea of keeping it in a "controlled environment" to avoid "unnecessary risk").

Difficulty Level
Medium. The phrase "controlled environment" and the contrast between the "single autonomous subsidiary" and the "company-wide rollout" provide a very direct, dual-pronged context clue for testing a model.