Utilize the input text as a context reference, choose the right relationship between 'grocery' and 'Walmart' from the options.
Options: industry, operator, chairperson, legal form

About 90%, 95% of the products grown by the farmers who lease our farms are sold to grocery stores like Kroger, Safeway, Costco Walmart and similar outlets, very little of the produce is being sold to the food service industry including restaurants and institutions like schools.
operator