Answer:
Its D, its repetive pleading rather than stating and reasoning
<span>❅☃ Deflation.
</span><span>❅☃ This is describing the process of the declining prices.
</span>❅☃ Think about it like this:
The balloon was deflating. This process is called deflation.
The balloon was going down in size. Much like the declining prices.
It would support commuting to work, transportation of foods to cities, transportation of raw materials to factories and produced goods out of factories, and transportation as a whole. Hope this helps.