Pretty Little Liars: Take The "I Know Who A Is" Poll

So I'm offically hooked on Pretty Little Liars, the hit ABC Family show airing Monday nights at 8/7 cental. Recently we've discovered that Allison and Jason are siblings of Spencer and that Holdon has a huge secret....so what does this all mean, how does this get us closer to find out who A is?

What We Know
-Holden has a huge secret
-He has a huge bruise on his ribs (remember Hannah ran A over)
-Officer Garrett is trying to sign into Caleb's computer
-A stole Caleb's computer
-The finale is going to be "Heartbreaking" according to producers
-We will know who A is March 19th
-Mona and A both are computer geniuses
-A and Allison's Murderer may not be the same person
-A tells Spencer they be "related him more ways then you think"
-Spencer just found out Jason and Allison are her siblings

What We Don't Know
-How Many People "A" is

Take the "I Know Who A Is" Poll Below