Final answer:
To show stored part field information in a Commerce line item grid column, you add a column in the Commerce Layout editor and map it to the part field. Option b is correct.
Step-by-step explanation:
The correct answer to the question “How can information that is stored in a part field be shown in the line item grid column in Commerce?” is by adding a column and mapping it to the field in the line item grid in the Commerce Layout editor. This allows information from the part field to be displayed in the line item grid, which is the visual representation of items in the shopping cart or order, commonly used in e-commerce platforms.
To accomplish this, you would typically go into the Commerce Layout editor and add a new column to the layout. After the column has been created, you would map it to the appropriate part field. This creates a direct link between the data stored in the part field and the line item grid, so when a user views their shopping cart, the information from the part field is displayed in the newly added column.