An eyewitness account can be unverifiable for several reasons, and the options you've provided illustrate different aspects of why this might happen.
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The eyewitness is biased about the event: Bias can distort a person's perception and recollection of events. If an eyewitness has a preconceived belief or emotional investment in the event, their account might be influenced by these factors, leading to inaccuracies.
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The eyewitness is emotional about the event: High levels of emotion—such as fear, stress, or excitement—can impair memory and perception. An emotional response may cause the eyewitness to focus on certain aspects while overlooking others or to misremember what occurred.
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The eyewitness is the only person who saw the event: When there's only one witness, there may be no corroborating evidence to verify their account. This lack of additional perspectives or evidence makes it difficult to confirm the reliability of their testimony.
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The eyewitness shares multiple perspectives about the event: If an eyewitness recounts the event in various ways, it raises questions about the reliability of their testimony. Inconsistencies in their account can lead to doubts surrounding the accuracy and truthfulness of what they witnessed.
Any of these factors can contribute to an eyewitness account being unverifiable, highlighting the complexities of human perception and memory.