15. A __ connects the engine cut-off switch to the operator's wrist or PFD. a sensor b lanyard C guard

## Step 1<br />The problem is asking us to identify the correct term that connects the engine cut-off switch to the operator's wrist or Personal Flotation Device (PFD). The options provided are: a sensor, a lanyard, and a guard.<br /><br />## Step 2<br />We need to understand the function of each option. A sensor is a device that detects or measures a physical property and records, indicates, or otherwise responds to it. A guard is a protective barrier or a person who protects others. A lanyard is a cord or strap that is used to secure or support something.<br /><br />## Step 3<br />In the context of the problem, the term that connects the engine cut-off switch to the operator's wrist or PFD is the lanyard. This is because a lanyard is used to secure the operator's wrist or PFD to the engine cut-off switch, ensuring that the operator is always connected to the switch and can cut off the engine if necessary.