The Gift Entry process in Nonprofit Cloud is designed to be flexible and extensible. Salesforce provides a set of standard Screen Flows that handle the user interface and logic for entering single gifts or batches of gifts.

For a consultant, the primary way to customize the "user experience" of gift entry without writing custom code is to leverage Salesforce Flow.

Customization Steps:

Locate Standard Flows: The consultant goes to Setup > Flows and finds the standard templates provided for Fundraising (e.g., the flow that powers the "New Gift" button).

Clone the Flow: Because standard flows provided by Salesforce are often protected or intended to be templates, the consultant clones the flow to create a "Save As" version.

Modify Logic and Fields: In the cloned flow, the consultant can add custom validation logic, remove unnecessary fields to simplify the UI for data entry clerks, or add a specific step to capture "Custom Metadata" unique to the organization’s needs.

Activate and Override: Once the custom flow is active, the consultant updates the Action Buttons or Lightning Pages to point to the new custom flow instead of the standard one.

Why other options are incorrect:

Invocable Actions (Option A): These are modular pieces of Apex code that perform specific tasks (like "Calculate Tax"). While they can be used inside a flow, they cannot be "cloned" in the same way a flow can; they are fixed logic provided by the system.

Lightning Web Components (Option C): While LWCs can be custom-built, the standard NPC components (like the Gift Entry table) are managed by Salesforce and are not "clonable" by a consultant in the Setup menu. Cloned Flows provide the highest degree of declarative customization for the gift entry workflow.