Which comparison is humorous?
a. In Barrio Boy, Galarza compares his initial fear of his principal with his love for his teacher.
b. In "Cub Pilot," Twain compares his emotional outburst with Mr. Bixby's calm demeanor.
c. In Barrio Boy, Galarza compares his American school to his Mexican school.
d. In "No Gumption," Baker compares the career opportunities available to girls with those available to boys.