Question

in what ways were the collar harness and the double-bladed plow similar?
they both made animals less necessary on farms.
they both made book printing in china easier.
they both made chinese farmers jobs easier and more efficient.

Explanation:

• Analyze the first option: Collar harness and double - bladed plow are farm - related tools, and they actually rely on or use animals (like horses for the harness), so they don't make animals less necessary. Eliminate this option.
• Analyze the second option: Collar harness and double - bladed plow are agricultural tools, while book printing is a different field (related to printing technology like movable type). So they have nothing to do with book printing. Eliminate this option.
• Analyze the third option: The collar harness allows animals to pull plows or other farm equipment more effectively, and the double - bladed plow is a more efficient plowing tool. Both of these tools are used in farming by Chinese farmers, and they help to make the farmers' work easier and more efficient.

Answer:

The option "They both made Chinese farmers' jobs easier and more efficient." (the third option in the list)