Example plans)
The task is to select Canada, Bosnia and Herzegovina from the scroll list and click Submit.
Here is a plan to solve this example task on the same webpage with the autonomous agent. 

1. clickoption //option[text() = 'Canada']
2. clickoption //option[text() = 'Bosnia']
3. clickoption //option[text() = 'Herzegovina']
4. Clickxpath //*[@class="secondary-action"]