Hi Rahul,
I don't think you would have authorization to grant this, so ask your Admin.
Anyways, if you want, you can try granting this privilege but most probably you will get an authorization error.
Go to Security folder, expand Users and then select your user and double click on it - select Object Privileges tab and select '+' and then select "GRANT_ACTIVATED_ROLE" and give Execute privilege.
Regards,
Vivek