What other agricultural technique was used to mitigate the pink bollworm from destroying Bt cotton crops?
Link to the article if you need to re-read it.
Non-Bt crops were planted near Bt crops to allow survival of susceptible insects.
O All Bt crops were removed from the fields and were replaced with non-Bt crops.
All Bt crops were removed from the fields and were replaced with new genetically engineered plants
O Non-Bt crops were planted in fields at a different time than Bt crops.