1. Understanding the Context:
- The sentence describes a transformation of New Deal economic strategies from being "flexible and adaptable" to becoming "rigid policies" due to bureaucracy.
- We need words that describe this process of becoming rigid or losing effectiveness.
2. Analyzing the Options:
C. ossification ( $\(\checkmark\)$ Best fit): This literally means the process of becoming rigid or turning into bone. It perfectly matches the idea of flexible strategies becoming rigid policies.
- F. obsolescence ( $\(\checkmark\)$ Strong secondary fit): This means becoming outdated or obsolete. While slightly less precise than ossification, it fits well because rigid bureaucratic policies often become obsolete over time.
- A. deterioration: While this could work (as rigid policies may deteriorate in effectiveness), it's more general and less precise than ossification.
- Other options (B. resurrection, D. calibration, E. preservation) either contradict the meaning or are irrelevant.
3. Why These Two Words Work Best:

Ossification directly captures the transformation into rigidity.
Obsolescence complements this by suggesting the eventual outcome of such rigidity policies becoming outdated and ineffective.
4. GRE Relevance:
- This question tests high-level vocabulary (ossification is a GRE-level word) and the ability to discern subtle differences in meaning.
- The dual answer format is typical of harder GRE questions that allow for complementary correct answers.

Final Answer: C. ossification and F. obsolescence
(Note: If only one answer is required, C. ossification would be the primary choice as it most precisely matches the transformation described.)