I think: it creates a rhythmic pattern..
Seems that you have missed the letter so I attached it below. Here is my answer.
Based on the given letter, I can say that the best supporting statement that we can add to this letter is that most drivers in America have the age of eighteen and above. The answer for this would be option D. Hope this helps.
A:
Starting-Staring-String-Sting-Sing-Sin-In-I
I’m not sure the context, but it could be because Christmas is a family filled event that brings a lot of joy to people. A lot of people can relate to this event as well
I Think The answer is either c or b I hope it helps Message Me if I’m wrong and I’ll change My answer and fix it for you