* Auto - means "self" or "one's own"
* Mono - means "one" or "single"
* Arch - means "rule" or "ruler"
* Cracy - means "rule" or "government"
With this knowledge, we can deduce that the word most likely to mean "rule by a single individual" is:
Monarchy
Here's why:
* Mono (one) + Arch (rule) + Cracy (government) = Rule by one person
Let's look at the other options:
* Autocracy - This means "rule by oneself" or "self-rule," which is similar to monarchy.
* Democracy - This means "rule by the people," which is the opposite of rule by a single individual.
Therefore, monarchy is the word that most accurately describes rule by a single individual.