Pedro wa aigned to find out how much of 12 gram of radioactive iotope Francium-222 would be left after a period of time. It half-life i 15 minute. How much remained after 50 minute?
A. 1. 380 g
B. 3. 5979 g
C. 1. 1906 g
D. 4. 7006 g
E. 2. 22133 g