Explanation:

When configuring Payment Methods in Salesforce B2C Commerce Business Manager, it’s important to understand how defaults and UI behaviors work. Certain restrictions ensure transactional integrity and consistent customer experience.

✅ Option A: You can't delete a default payment method. You can only disable it. Correct and important to note.
Default payment methods (like Credit Card) are required to maintain baseline functionality.
Disabling a payment method prevents its use during checkout but retains its configuration for reference or reactivation.
Deletion is not allowed on defaults to avoid breaking checkout or existing orders.

❌ Option B: You can add only up to 5 payment methods
Incorrect
There's no hardcoded limit of 5 payment methods.
Merchants can configure many methods such as:
Credit card (Visa, MasterCard, etc.)
PayPal
Apple Pay
Gift Cards
Custom services
Performance and usability should guide practical limits, not platform constraints.

❌ Option C: You can't drag and drop the column headers to change the sort order
Incorrect
In the Business Manager UI, especially in grid views (e.g., Payment Methods list), merchants can click column headers to sort by name, status, or type.
While drag-and-drop is not used for sorting headers, interactive column-based sorting is supported.

🔗 Reference:
“You can enable or disable payment methods as needed, but default methods must remain defined to preserve checkout functionality.”
— Salesforce B2C Commerce | Payment Method Configuration Guide
📖 Payment Method Setup Guide