Final answer:
Beth's observation of Sam's changed 'face' suggests a transformation of a mental or emotional nature, not physical, which aligns with option b) Sam has experienced a change in personality or emotions.
Step-by-step explanation:
It appears that Sam has experienced a significant change, but not in physical form. Based on the description provided, Sam's transformation is of a mental or emotional nature. The term 'face' in this context does not refer to a physical alteration of his features, but rather a change in his expression or the aura he projects, which is often reflective of one's mental state. Given Beth's observation and the mention of his changed behavior and neglected occupations, it points to option b) Sam has experienced a change in personality or emotions. The evidence within the text suggests that Sam is undergoing mental distress, potentially in response to traumatic events or psychological issues, as supported by the use of the words 'unconsciously', 'uncomprehending', and 'confounding'. Furthermore, the mention of bedlam, a historical reference to a mental institution, and the effects of the mind on the physical brain confirm this interpretation.