The radioisotope Phosphorus-32 is used in leukemia therapy. The half-life of this isotope is 14.26 days.

Which equation determines the percent of an initial amount of the isotope remaining after t days?

A) A = 100 (1/2) ^ 14.26 / t
B) A = 14.26 (1/2) ^ 100 / t
C) A = 100 (1/2) ^ t / 14.26
D) A = 14.26 (1/2) ^ t / 100