Question

Which commercial mode of transportation was not included in the transportation revolution of the 19th century?
a. Boats
b. Trains
c. Cars
d. Planes

Answer 1

It would be "Planes" that is a mode of transportation that was not included in the transportation revolution of the 19th century, since planes in terms of commercial and person travel did not come into being until much later. 

Answer 2

Which commercial mode of transportation was not included in the transportation revolution of the 19th century?

a. Boats

b. Trains

c. Cars

d. Planes

The answer would be Planes (d.) Hope this helps !~