Answer:
B. They could determine the methods used to harvest crops and procure natural resources or animal products.
Explanation:
This can be solved by figuring out which answer is not the correct one first:
A does not work since guilds commonly did this.
C does not work since even now certain jobs still require the necessary training required to gain certain jobs, especially ones requiring special skills like electrician or engineer.
D is pretty obvious, so it cannot work here.
Therefore since A, C, and D are not the correct answers, B is the correct answer.
