如何在量角器测试中使用相同的类获得不同的dropdownlist选项？

I've been trying to get a randomly element from my dropdownlist but I have 3 dropdown list with the same class in my page. I tried with the label and following-sibling but it didn't work. This question is not about how to get any option in the dropdownlist, but how to get the options of three diferent dropdownlist and click.I've been trying to get a randomly element from