The core of this question revolves around understanding the natural process of language evolution, specifically the gradual disappearance of certain words. Option B correctly identifies this process as natural and draws a parallel to the evolution observed in Old English, which is a key insight into how languages change over time. Options A, C, and D, while plausible, do not capture the essence of language evolution as a natural process. A focuses on usage, which is a factor but not the primary reason for disappearance. C and D attribute the disappearance to external factors (technology and education) rather than recognizing it as an inherent aspect of language evolution.