Read this sentence from paragraph 4. The up-and-down motion of the backpack takes away
some of the weight of the pack.
Which detail should be added to paragraph 4?
Click for the passage, "The Electric Backpack."
A. The walker will not have to carry batteries.
B. The walker will not get tired as fast.
C. The walker will make more electricity.
D. The walker will get stronger faster.

B. The walker will not get tired as fast.

Explanation:

Based on the given passage, it is narrated that new electric backpacks which could be used as generating sets to power up electrical appliances were available and the up and down movement of the backpack acted as the generator.

From paragraph 4 of the given passage, it is said that the up and down motion reduces the weight of the pack.

Therefore, the detail that should be added to it is that the walker will not get tired as fast.

by our hard work

for that

sorry forgo thte passage