Final answer:
Tom might be more concerned about physical risk the next time he buys boots due to his previous experience of tripping and injuring himself while wearing UGGs.
Step-by-step explanation:
When considering the scenario where Tom tripped, fell, and scraped his knee while wearing UGGs, the type of risk he might be more concerned about the next time he goes to buy boots would be C. Physical risk. Physical risk pertains to the potential for a product to cause harm to the user's body. Since Tom had a negative physical experience due to the boots, he might be more cautious to ensure that the next pair of boots has better traction or support to prevent a similar accident. Performance risk involves the possibility that the product will not perform as expected, financial risk relates to the money lost if the product doesn't satisfy the buyer, and psychological risk touches on the mental impact of a product not meeting expectations.