A is the correct answer.

The correct answer is:
✅ A. Existing field values will remain unchanged.

Explanation

When you change an Auto Number field to a Text field in Salesforce:

The existing auto-generated values (e.g., A-0001, A-0002) remain as they are.
They are simply treated as text going forward.


Salesforce allows this change because both Auto Number and Text are stored as strings internally.


❌ Why not the others?

B. Existing field values will be Converted → No conversion happens; they remain the same.
C. Existing field values will be deleted → Data is not deleted.
D. Existing auto number field to Text is prevented → This change is allowed in Salesforce.

Correct Answer: B. Existing field values will be Converted
A. Existing field values will remain unchanged. ❌ Not quite — they don’t “stay” as auto number, they are converted to text.
B. Existing field values will be Converted. ✅ Correct — auto number values become text values.
C. Existing field values will be deleted. ❌ Wrong — Salesforce never deletes values on a type change unless it’s incompatible (e.g., Text → Number where values can’t convert).
D. Existing auto number field to Text is prevented. ❌ Wrong — Salesforce allows this conversion.

A. Existing field values will remain unchanged.

A is the correct answer