Final answer:
The correct sequence of reference in recovering from an unusual attitude in instrument flying typically begins with the Attitude Indicator, but options presented omit this. The closest option is B) TC - ASI - ALT - VSI - Compass, though it lacks the AI which is an essential first step. The question may be simplified for illustration and may not fully represent the professional process.
Step-by-step explanation:
When recovering from an unusual attitude in instrument flying, the correct sequence of instruments to reference is generally the Attitude Indicator (AI), followed by the Turn Coordinator (TC), then the Airspeed Indicator (ASI), after that the Altimeter (ALT), and finally the Vertical Speed Indicator (VSI) and Compass. This specific order, often summarized as 'attitude, then power, then instruments', helps pilots to first establish the correct aircraft orientation using the AI, then to coordinate the turn using the TC, manage the speed with the ASI, and finally maintain or adjust altitude using the ALT and VSI, while keeping track of the heading with the compass.
However, this specific question and the choices provided seem to be a variation or simplified depiction of the process, and none of the options entirely fit the standard recovery procedure. The closest option in terms of the sequence that an instrument-rated pilot might use is B) TC - ASI - ALT - VSI - Compass, which would be helpful in re-establishing a safe and coordinated flight attitude, but it notably lacks the AI, which is typically used first. Therefore, it's important to note that the provided options may be simplified for educational or illustrative purposes and may not fully align with the professional pilot recovery process from unusual attitudes.