Which error occurs due to insufficient reliance on multiple instruments for attitude and performance information?

The choice that accurately represents the concept of insufficient reliance on multiple instruments for attitude and performance information is the emphasis error. This type of error occurs when a pilot places undue focus on one particular instrument while ignoring or undervaluing the information provided by others. This can lead to a misinterpretation of the aircraft's actual attitude or performance, resulting in poor decision-making.

In instrument flying, various indicators provide critical information regarding an aircraft's orientation and performance. If a pilot neglects these multiple sources by focusing too heavily on one instrument, it may lead to a misunderstanding of the overall situation, potentially compromising flight safety. Emphasis errors can particularly arise when pilots become comfortable with specific instruments and fail to maintain an appropriate scan of all relevant instruments, which is essential for accurate situational awareness.

Other options such as overreliance error and substitution error have their implications but do not specifically address the failure to utilize a comprehensive array of instruments effectively in the context of attitude and performance information. Cross-check error, while relevant, relates more to the act of verifying information between instruments than to the consequences of insufficient reliance on them. Thus, emphasizing one instrument at the expense of others leads to impaired judgement and can jeopardize flight safety, making emphasis error the most relevant choice