Final answer:
The addition of a generator to a backpack allows a backpacker to carry more items without increasing the overall weight, as the need for separate batteries for devices like cell phones and flashlights is eliminated. The correct option is D. the backpacker can carry more things, but it will not increase the weight of the backpack.
Step-by-step explanation:
The student's question pertains to the impact of having a generator in a backpack instead of carrying batteries. The correct answer would be that if adding the generator means that a backpacker does not need to carry batteries, then the backpacker can carry more things, but it will not increase the weight of the backpack.
This implies that devices such as a cell phone or a flashlight in the backpack could be powered by the generator, thus eliminating the need for separate battery packs and potentially allowing for more available space for other items.