Important rock-and-rol artists in the 1970s and 1980s included which of the following? A. Pink Floyd B. Glenn Miller C. Elvis Presley D. None of the above

The question is asking about important rock-and-roll artists from the 1970s and 1980s. Pink Floyd is a British rock band that was formed in 1965 and released their breakthrough album "The Dark Side of the Moon" in 1973, which is considered one of the greatest albums of all time. Glenn Miller was a big band musician and bandleader in the 1930s and 1940s, which is before the time period in question. Elvis Presley, known as the "King of Rock and Roll," was most popular in the 1950s, which is also before the time period in question. Therefore, the correct answer is A. Pink Floyd, as they were an important rock-and-roll band during the 1970s.