What rhetorical device is used in this excerpt from mark twain's "the danger of lying in bed"?

the man in the ticket-office said:

"have an accident insurance ticket, also? "

"no," i said, after studying the matter over a little. "no, i believe not; i am going to be traveling by rail all day today. however, tomorrow i don't travel. give me one for tomorrow."

the man looked puzzled. he said:

"but it is for accident insurance, and if you are going to travel by rail—"

"if i am going to travel by rail i sha'n't need it. lying at home in bed is the thing i am afraid of."

i had been looking into this matter. last year i traveled twenty thousand miles, almost entirely by rail; the year before, i traveled over twenty-five thousand miles, half by sea and half by rail; and the year before that i traveled in the neighborhood of ten thousand miles, exclusively by rail. i suppose if i put in all the little odd journeys here and there, i may say i have traveled sixty thousand miles during the three years i have mentioned. and never an accident.

a.
allusion
b.
rhetorical question
c.
anecdote
d.
logic