<span>. built dams to provide for irrigation</span>
irrigation was used to farm lands that were originally arid and semi arid<span>4. converted bad land into agricultural fields</span>
<span>these bad lands otherwise ARID AND SEMI ARID were successful reclaimed through irrigation methods.
</span><span></span><span>5. invented new farming methods
</span> improvements in agricultural techniques and tools bolstered the agricultural sector making it one of the important source of taxes for the dynasty.
I believe it is option C
Hope this helps
The Jet Stream hope it helps
