Which choice would function as a thesis statement for an essay about knuckleball pitchers in Major League Baseball?
A) The knuckleball pitcher is a rare species in baseball.
B) Phil Niekro pitched for several years as a knuckleballer.
C) It is a difficult pitch to master and control, but some are able to do it well. D) Tim Wakefield threw the knuckleball, at times skillfully, but at other times poorly.
