Answer:
(2) He took the inner bark of a mulberry tree and bamboo fibers, mixes them with water, and pounded them with a wooden tool.
Step-by-step explanation:
The only parallel ideas in the set of given sentences are in (2), where the parallel concepts are ...
- the inner bark of a mulberry tree
- bamboo fibers
The error seems to be that, on first reading, we aren't sure whether we're reading about the inner bark of bamboo.