Correct Answer:
D. Smith, Stanley, and Shore
The statement "Curriculum is a written plan" is attributed to Smith, Stanley, and Shore. This definition emphasizes the structured, documented, and intentional nature of curriculum, highlighting that it is a pre-determined guide for educational experiences. While other theorists like Tyler and Ragan are significant in curriculum development, their definitions often encompass broader aspects such as objectives, learning experiences, and evaluation. Tyler, for instance, is known for his rational model focusing on four fundamental questions, which is more comprehensive than simply a "written plan." Albert is not primarily associated with this specific definition.