Which statement about Cyrus McCormick is true?

• A. Invented the vacuum milking glove
• B. Invented the light bulb
• C. Invented the telephone
• D. Invented the mechanical reaper

Answer: (D)

The idea being tested is how one invention transformed farming through mechanization. Cyrus McCormick is known for creating the mechanical reaper, a horse-drawn machine that could cut grain much faster than harvesting by hand with sickles and scythes. This breakthrough dramatically increased harvest speed and reduced labor, helping farmers cultivate and harvest larger fields and fueling changes in agriculture and the broader economy. McCormick’s invention also led to the growth of a company that produced harvesters, shaping the agricultural tools industry.

Those other statements don’t fit because they point to inventions by different inventors: the light bulb is associated with Thomas Edison, the telephone with Alexander Graham Bell, and the concept of a vacuum milking glove isn’t linked to McCormick.