Read the following passage carefully and answer the question given below. Chocolate is a food product made from cocoa beans, consumed as candy and used to make beverages and to flavour or coat various confections and bakery products. Chocolate is rick in carbohydrates. It is an excellent source of quick energy, and it also contains minute amounts of the stimulating alkaloids theobromine and caffeine. The cacao tree was cultivated more than 3,000 years ago by the Mayan, Toltec, and Aztec peoples, who prepared a beverage from its fruit, ( sometimes using it as a ceremonial drink ) and also used to bean as a currency. The Mayans considered chocolate to be the food of the gods, held the cacao tree to be sacred, and even buried dignitaries with bowls of the substance ( along with other items deemed useful in the afterlife). In fact, the identification of the word ka-ka-w ( "cacao") inscribed on those containers was key to deciphering the Mayan's phonetic manner of writing. Spain was the earliest European country to incorporate chocolate into its cuisine, but exactly how that happened is vague. It is known that Christopher Columbus took cocoa beans to Spain after his fourth voyage in 1502, though little was made of it at that time. It has been commonly thought that in 1519, Montezuma II, the Aztec ruler of Mexico, served a bitter cocoa-bean drink to the Spanish conquistador, Hernan Cortes, who subsequently introduced the drink to Spain. Why did the Mayans bury dignitaries with bowls of cocoa substance ?