Final answer:
Workers' compensation cases are generally kept open for 2 years after the last date of treatment, allowing for any late-developing issues to be addressed, but this can vary depending on jurisdiction.
Step-by-step explanation:
When dealing with workers' compensation cases, the length of time a case remains open after the last date of treatment can vary by jurisdiction. However, the generally accepted answer for how long workers' compensation cases are kept open is B. 2 years. This time frame allows for any potential complications or late-developing issues related to the injury to be addressed. It's important to note that this period may differ based on the laws of the state or country in which the claim is made, and claimants should verify this information based on their specific location.