Which invention was in use before the second industrial revolution? A. reaper B. telephone C. light bulb D. zipper

The invention that was in use before the second industrial revolution is A

The second industrial revolution is also the Technological Revolution

The Reaper was widely used to cut down and harvest

so the answer would be A

the revolution started at 1870s

the light bulb was invented at 1879

telephone at 1876

zipper at 1890

and the reaper was invented in 1831 so it was already a popular harvesting tool by the time of the revolution