Strong metal tools allowed bronze age farmers to grow surplus crops and trade them with neighbors for goods such as tools. the farmers needed a method for recording their exchanges and keeping track of how much surplus they had left. which of these conclusions do these two events most strongly support?

a. writing gave rise to the trade of items.
b. writing led to an increase in agricultural output.
c. writing was an indirect result of the rise of technology.
d. writing was necessary for the invention of advanced tools

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