Step 1: Concept Comprehension
The objective is to identify the text that does not pertain to architecture among the provided options. This requires understanding the central theme of each text.
Step 2: Text Analysis
(A) Śilpaveda: An Upaveda, this text is foundational to 'śilpa' (arts, crafts, architecture). It is definitively an architectural text.
(B) Yajurveda: A primary Veda, its focus is on liturgy and sacrificial rituals. While it includes Śulbasūtras detailing the geometry of fire altars, its core subject is religious ritual, not architecture.
(C) Arthaśāstra: A treatise on statecraft and political economy, it significantly covers state-related architecture, including urban planning, fortifications, and public buildings, making it a key source for secular architecture.
(D) Mānamayukha: A classical text within the Vastu Shastra or Śilpaśāstra tradition, it exclusively addresses architectural principles.
Step 3: Conclusion
Śilpaveda and Mānamayukha are direct architectural texts. Arthaśāstra contains substantial architectural content. Yajurveda, primarily focused on ritual, is not an architectural text, despite some construction-related information. Therefore, Yajurveda is the correct identification.