Which method is typically NOT considered effective against vampires?

The correct answer highlights that building a wooden coffin is not typically recognized as an effective method against vampires. In vampire lore, traditional methods to ward off or destroy vampires are more focused on direct actions that harm or incapacitate them, such as driving a stake through the heart or decapitation. These actions are rooted in the belief that vampires have to be physically destroyed in order to prevent them from rising again.

In contrast, a wooden coffin, while often associated with the resting place of the dead and sometimes vampires, does not constitute a method of confrontation or harm. Instead, it represents a containment or storage of the vampire rather than an act that would neutralize their threat. The other options directly relate to the traditional means of slaying a vampire, making them actionable strategies within the folklore, whereas simply building a coffin lacks that proactive element.