The correct answer is: A. 5 years.
A person can be presumed to be dead if he has not been heard about for 5 years. This is the rule in most jurisdictions, including the United States. The rule is based on the idea that if a person has not been heard from for a long period of time, it is likely that they are dead. This rule can be used to declare a person legally dead, which can have important consequences, such as allowing their estate to be distributed.
There are a few exceptions to the 5-year rule. For example, if there is evidence that the person is still alive, such as a recent sighting or communication, the rule may not apply. Additionally, if the person is a minor, the rule may be extended to 10 years.
If you are considering applying for a declaration of death, it is important to speak with an attorney to discuss your specific situation.