Service firms are best described as firms that perform services for a fee, such as:

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The key idea is that service firms earn revenue by performing services for a fee rather than by selling physical goods. The examples listed—consulting, legal services, hospitals, funeral services, hotels, beauty salons, printing services, and recruitment agencies—are all about providing expertise, care, or facilitation in exchange for payment. That distinguishes them from firms that primarily buy and sell merchandise, which would be about trading tangible products instead of offering a service.

The other options describe different business models: buying and selling merchandise reflects a trading or merchandising focus; being a corporation with stockholders is about corporate form, not the nature of the business; investing in real estate centers on asset ownership and investment rather than delivering services.