The correct answer is:
c. 7.3 x 10^12
To convert 7.3 trillion into scientific notation, you need to represent it as a number between 1 and 10 multiplied by a power of 10. In this case, 7.3 trillion can be written as 7.3 x 10^12.
Remember, in scientific notation, the number before the "x" should be between 1 and 10, and the power of 10 indicates how many places the decimal point was moved to represent the original number.
