Question

property taxes are based on
how much a property is worth.
when a property was purchased.
who lives on a property.
where a property is located.

Explanation:

Property taxes are typically based on the assessed value of the property, which relates to how much a property is worth. The other options (who lives on it, when it was purchased, where it's located) may factor into value but the primary basis for property taxes is the property's worth.

Answer:

how much a property is worth.