The correct options are
A Clearing the forest lands.
B Building of embankments near rivers.
C The construction of canals for irrigation.
Agriculture in the Chola empire flourished due to many reasons. They cleared forest lands, to use more lands for agriculture. They used to rely on the water from the Kaveri delta, to irrigate their fields. During monsoons, the rivers tended to overflow. To overcome this and prevent damages to the crop, they built embankments near the rivers. They also constructed canals as time passed, to irrigate many crops and fields at the same time.