Questions 48-50 refer to the following article.        In recent years, fall has become virtually synonymous with pumpkin spice, as U.S. grocerystories and cafes tout the flavor in everything from beer and lattes to Oreo cookies. But the trend is evenmore novel-if not downright impressive-when you consider how Americans once viewed the squash.        Among colonial settlers, pumpkin "was a food of last resort," says Cindy Ott, author ofPumpkin: The Curious History of an American Icon. Because the crop was a new-world native, it wasscen as primitive. In fact, "pumpkin eater" was a derogatory term for a poor, ignorant farmer. (Hence thenursery thyme "Peter, Peter, Pumpkin Eater," about a man who can't read or spell.) Things began tochange when Americans flocked to cities in the mid-19th century. Nostalgia for farm life meantnostalgia for pumpkins. They were rebranded as a treat, especially after the 1844 publication of LydiaMaria Child's poem 'Over the River and Through the Wood," which ends with a cheer for pumpkin pie.        But if nostalgia saved the pumpkin's reputation, the crop returned the favor. In the 20th century,small producers threatened by industrial farms found that roadside pick-your-own pumpkin patches andpumpkin festivals could draw customers to the country which only made the pumpkin even more of asign of the season. Last year, sales of pumpkin-flavored products generated more than $400 million, anall-time high.
【題組】48. What is the article mainly about?
(A) The relation between pumpkin and literature.
(B) The reasons why pumpkin causes nostalgia.
(C) The cultural evolution of pumpkin.
(D) The change of pumpkin flavor.