How can Helen provide free delivery for a small group of promotional products?

How can Helen provide free delivery for a small group of promotional products?

A)Set the default delivery for all products to a flat rate of £0.00
B)Add “Free delivery” to the Shopping campaign promotional text
C)Remove all delivery options from the Google Merchant Center account
D)Update the ‘delivery’ attribute to a fixed delivery price of £0.00 for only the promotional products

Answer is – Update the ‘delivery’ attribute to a fixed delivery price of £0.00 for only the promotional products