[1] It will be easy if BD beat SL and India beat SL.
[2] If SL win against BD and loose against India then definitely SL will qualify for Super 8 (since they have high net run rate) and it will be a NRR competition between India and BD. This is tough becase we need to wait for the last match (Ber Vs BD) and BD should not win by huge margin. This is something out of our control.
Hence, it will be good if SL loose against BD and India.