Analyze the relationship between 'THORNTONS' and 'chocolate' within the context of the input sentence.
Options: employer, member of, product/material produced, owner of

THORNTONS - An offer by Nutella spread maker Ferrero to buy out investors in British chocolate retailer Thorntons has reached a take-up of nearly 75 percent, the head of the Italian confectionery group was Quote: d as saying.
product/material produced