How to click on an object in selenium c#?

Question

C++ / C#

There are two span objects. How can I click on the last one?
< span aria-checked = " true" class="_8r0M_" role=" switch " tabindex="0">Text< /span >
< span aria-checked = " true" class="_8r0M_ DEMIF " role=" switch " tabindex="0">Text</span>

Where there is DEMIF in the class, it means that the object is selected.
Tried it like this doesn't work
IWebElement sub = Browser.FindElement(By.ClassName("_8r0M_ "));
sub.Click();
Help!!!