How does Magento support multiple shipping options for merchants?

Magento supports multiple shipping options for merchants primarily by allowing the configuration of shipping rules, rates, and options during the checkout process. This capability enables merchants to define various shipping methods tailored to their needs, such as different carriers, delivery speeds, and pricing structures.

By customizing shipping rules, merchants can create specific conditions under which certain shipping options become available based on factors like order total, customer location, or product types. This flexibility helps enhance the customer experience by providing diverse shipping choices, allowing shoppers to select the option that best meets their needs in terms of speed and cost.

The other choices do not align with the core functionality of Magento regarding shipping options. Limiting the number of carriers would restrict the flexibility that merchants need to effectively serve their customers, while offering a single shipping method or free shipping on all orders does not adequately support the diverse shipping requirements that many businesses face.