Based on your Linux machine setting, you may see the following error when adding the -b option. In this case, you need to type your password while running the sudo command:
In this case, add -K (ask for the sudo password) and run again. It will ask for your sudo password when running the Ansible command, as shown in the following screenshot:
If your Linux uses the su command instead of sudo, adding --become-method=su to run the Ansible command could help. Please read the Ansible documentation for more details : http://docs.ansible.com/ansible/latest/become.html