Answer:
The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—eons, eras, periods, epochs, and ages.
Not 100% sure, but I think its D.
In *2012 (I'm pretty sure that's what you're asking), Barack Obama was acting President of the United States of America.
55 electoral votes. Hope you find that useful