Final answer:
An example of slack resources in JD Thompson's idea is maintaining additional inventory for unexpected demand, which provides a buffer against unforeseen situations and contributes to operational flexibility.
Step-by-step explanation:
An example of slack resources in JD Thompson's idea would be b) Additional inventory for unexpected demand. Slack resources refer to the extra capacity that organizations maintain to handle unforeseen situations or to capitalize on potential opportunities. Keeping additional inventory is an example of slack resources because it allows a company to meet an unexpected increase in demand without the need for immediate production ramp-up, therefore providing flexibility and serving as a buffer against uncertainties in the business environment.