I would say A.
but C would be my second guess
For something to have value, it must have utility, or the capacity to be useful and provide satisfaction.
Answer: The 1974–75 Shatt al-Arab clashes were a previous Iranian-Iraqi standoff in the region of the Shatt al-Arab waterway during the mid-1970s. Nearly 1,000 were killed in the clashes. It was the most significant dispute over the Shatt al-Arab waterway in modern times, prior to the Iran–Iraq War.
Explanation:
The plow was to the agricultural society as the steam engine was to the industrial society. Agriculture got a great boost with the invention of the plow as it made cultivation faster and easier. Similarly the invention of the steam engine made industrial products move faster and to far away places. This helped the industries garner bigger amount of profits.
