Which of the following masses is/are equivalent to seventy billion metric tons?
1) 7.0x10^10 metric tons
2) 0.070 trillion metric tons 3) 70,000 million metric tons
4) all of them are equal to seventy billion metric tons

The correct answer is 70,000 million metric ton. 
Seventy billion metric ton = 70, 000,000,000 = 70 * 10^9
70,000 million metric ton = 70,000 * 10^6 = 70 * 10^9
Thus, seventy billion metric ton is equivalent to 70,000 million metric ton.

If this is a true or galse then its true but if not then what is the question?