Which of the following comparisons is humorous?

A. In "Cub Pilot," Twain compares his emotional outburst with Mr. Bixby's calm demeanor.

B. In Barrio Boy, Galarza compares his American school to his Mexican school.

C. In Barrio Boy, Galarza compares his initial fear of his principal with his love for his teacher.

D. In "No Grumption," Baker compares the career opportunities available to girls with those available to boys.