James Converts a Table with This Notation: INVOICES (INVOICE_NUM, INVOICE_DATE

Multiple Choice

James converts a table with this notation: INVOICES (INVOICE_NUM, INVOICE_DATE, (ITEM_ID, QUANTITY) )
Into a table with this notation:
INVOICES (INVOICE_NUM, INVOICE_DATE, ITEM_ID, QUANTITY)
James has _____.

A) made the table design worse
B) converted a table in first normal form into a table in second normal form
C) converted an unnormalized relation into a table in first normal form
D) added a repeating group to a table