Question

1. the introduction of the magnetic compass and paper currency during the tang and song dynasties influenced chinese society by – making trade easier increasing crop yields limiting foreign invaders improving government efficiency clear all

Explanation:

The magnetic compass aided navigation for trade, and paper currency simplified transactions. Increasing crop yields relates to agriculture (not compasses/currency). Limiting foreign invaders is about defense (unrelated to these innovations). Improving government efficiency doesn't directly link to trade tools/currency. So the correct effect is making trade easier.

Answer:

A. making trade easier