Final answer:
Owning a rental property is a form of passive income because it can generate regular income without the continual active involvement of the owner. In contrast, the other options require active participation.
Step-by-step explanation:
The question pertains to identifying which option is a form of passive income. Passive income is earnings derived from a rental property, limited partnership, or other enterprise in which a person is not actively involved. Given the choices, A. Owning rental property is the correct answer, as it can provide a steady stream of income without the direct involvement of the owner necessary for day-to-day operations.
In contrast, teaching golf, earning wages from a part-time job, and trading stocks normally require active involvement, and would therefore not be classified as passive income. With rental property, after leasing it to a tenant, the property can generate income through rent payments, which is considered a form of passive income. Stocks may potentially provide dividends, which is a passive income, but regular trading involves active engagement.