Step 1: Define each type of shed.
- A. Fully open shed: In this type (like with a tappet or dobby), a warp end that is up in one shed and required to be up in the next shed remains up. A warp end that is down and required to be up moves from the bottom to the top. This minimizes warp movement.
- B. Semi-open shed: This is characteristic of certain dobby mechanisms. Ends that need to remain up stay up, but ends that need to move from down to up only move halfway, meeting the ends coming down from the top at the center.
- C. Center closed shed: All warp ends, whether they were up or down, return to a central, level position after each pick. From this central line, they then move to their new up or down position for the next shed.
- D. Bottom closed shed: All warp ends, whether they were up or down, return to the bottom shed line after each pick. From the bottom line, the required ends are then lifted to form the next shed.
Step 2: Match the definitions with the descriptions in List II.
- A. Fully open shed matches with III. Unnecessary movements of the warps are avoided, because ends that need to stay up do so.
- B. Semi-open shed matches with IV. A few healds move half the distance..., describing the characteristic halfway movement.
- C. Center closed shed matches with I. All warp returns to mid-position....
- D. Bottom closed shed matches with II. All ends come down to the bottom position....
Step 3: Assemble the correct combination. The matching is A-III, B-IV, C-I, D-II. This corresponds to option (C).