Which component could be measured for continuity with the clutch pedal in the released position?

The start/clutch interlock switch is designed to prevent the engine from starting unless the clutch pedal is fully depressed. In the released position of the clutch pedal, you can measure continuity in this switch because it is directly linked to the operation of the clutch. When the pedal is up (released), the switch should be open, preventing current from flowing to the starter circuit, and this can be confirmed through continuity testing.

In contrast, other components such as the backup light switch, door switch, and ignition switch operate under different conditions and do not directly correlate to the position of the clutch pedal. The backup light switch is activated when the vehicle is placed in reverse, the door switch operates based on door status, and the ignition switch is related to the power supply for starting the vehicle, none of which depend on the clutch pedal position for continuity measurement. Therefore, the focus on the start/clutch interlock switch aligns precisely with the scenario described in the question.