In his research at Columbia University Charles Townes worked with all of the following EXCEPT______.

A．few people think that poetry is neutral
B．people always differ in their views about poetry
C．people rarely take a biased opinion about poetry
D．people generally think of poetry as extremely important or totally useless

A．is more than just words
B．is the poet's feelings about words
C．is anything but patterns of lines
D．is an experiment on the use of words