How did jan matzeliger change the shoemaking industry in the 1800s?

i know c is an incorrect answer.

a. stitching shoes was laborious, so matzeliger invented the sewing machine.
b. adding laces to shoes was laborious, so matzeliger invented the lacing machine.
c. adding heels to shoes was laborious, so matzeliger invented the heeling machine.
d. attaching the top of the shoe to the sole was laborious, so matzeliger invented the lasting machine.

The correct answer is D - Stitching shoes were laborious, so Matzeliger invented the sewing machine.

Before his invention, shoes were made and sewed by hand. After the invention of this machine by Matzeliger significant change was made to the shoes manufacturing - before the machine 50 pairs could be done in a 10 hour day, after the invention 150/700 pairs could be made. He obtained the patent for his invention in 1883.

which time period is this? or is this story fictional, i'm going to need more info to answer this question

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