Explanation
The correct answer is B: Rem.
In legal terms, a right against the world at large refers to a right that can be enforced against anyone in the world, rather than just a specific person or entity. This type of right is known as a "right in rem," which is a Latin term that means "right against the thing."
A right in rem is a right that is attached to a specific piece of property or asset, rather than a particular individual. This means that the right can be exercised against anyone who interferes with or infringes upon that property, regardless of whether they have any relationship or connection to the original owner or possessor of the property.
In contrast, a right in personam is a right that is enforceable only against a specific person or entity, rather than against the world at large. This type of right arises from a contractual or other legal relationship between two or more parties.
Therefore, since a right against the world at large is a right in rem, the correct answer to the question is B: Rem.