Suppose you could watch radioactive atoms decay. It would probably get quite boring as time went by. Why?

a. The initial decay rate is very fast, but the decay rate decreases over time.
b. Due to randomness, the last couple of radioactive atoms may take a long time before they become nonradioactive.
c. The pattern becomes very predictable.
d. Only a few radioactive nuclei are left to decay, so fewer and fewer atoms decay.
e. The rate of decay decreases with each half-life cycle.
f. The probability that an atom will decay is reduced with each half-life cycle.