What may be said about these two passages?

A) Both "Asthma" and "Treating Asthma" speak of the different types of asthma.
B) Neither "Asthma" nor "Treating Asthma" speak of the different types of asthma.
C) "Asthma" speaks of the different types of asthma, but "Treating Asthma" does not.
D) "Treating Asthma" speaks of the different types of asthma, but "Asthma" does not.