What constitutes grand theft?

Grand theft is generally defined by the value of the property taken or the nature of the property involved. In many jurisdictions, including Idaho, the threshold value that differentiates grand theft from petty theft is significant. The correct option indicates that if the property taken is a firearm or livestock valued at over $150, it is classified as grand theft. This is because firearms and livestock are specifically valuable types of property, and legislatures often impose stricter penalties for their theft due to their societal importance and higher value.

In contrast, while a property value exceeding $500 might be a standard threshold in other contexts for grand theft, it is not the defining characteristic for all types of property, especially specialized categories like livestock and firearms. Additionally, taking property from a store without payment typically refers to shoplifting, a different offense that may not necessarily meet the criteria for grand theft, depending on the value. Lastly, the theft of any property valued at $100 would typically fall under petty theft in many jurisdictions, as it does not meet the higher thresholds associated with grand theft. Thus, the specific mention of firearms and livestock with a defined value solidifies option C as the correct answer.