Many people have been killed their and crossing the path is a reminder of that.
What’s the answers choices
A comma is used as a short pause to create meaning to the words you are saying, where you put the comma depends on what word in the sentence you wish to highlight the most
in my opinion i would put the comma in one of two places
<span>The long winding road, was dark and ominous.
</span><span>The long winding road was dark, and ominous</span>
Since an infinitive phrase is a phrase that focuses on the object of the verb and an infinitive verb is an -ing verb, your phrase is "taking advanced math".