The correct answer is option C, Picked and sorted by complex machinery hand-picked and sorted by a simple machine picked and sorted by hand
Complex machinery need following resources to operate – fuel, another machine to transport them to the site. High maintenance, electricity , resource for cleaning the machinery after use and the human resource to operate it
Simple machinery need following resources – fuel , maintenance, and the human resource to operate it
While if someone uses hand to work then in this case the only resource in usage is the human resource.
Thus it is clear that the maximum resources are used when the complex machine is used for harvesting corn while the least resources are used if harvesting is done manually by hand.