In following statements about Longfellow, which one is incorrect?
选项：

A:After his death, he was buried in the Poet's Corner of Westminster Abbey in London.
B:He is the most popular American poet in the 19th century.
C:In Longfellow’s poems, there is always a strong feeling of optimism.
D:Longfellow’s poems have a great influence in America's artistic and popular culture and always quoted even by speakers not knowing who wrote them.