A. Ten
B. Eleven
C. Twelve
D. Thirteen
Thousand, Million, Billion, Trillion, Quadrillion, Quintillion-each comes with three additional zeroes. Even though there are names beyond Quintillion, they are not so well known and it is better to represent them using exponential notation.
The correct answer to the question: "How many zeros are there in one Trillion?" is "Twelve".
