Refer to the input text as context and select the correct relationship between 'Starbucks' and 'coffee' from the available options.
Options: product/material produced, chairperson, chief executive officer, currency

Yet on July 6, Starbucks said that its costs were rising and that it was raising the price of much of its brewed coffee by 5¢ to 20¢ a cup.
product/material produced