25) Based on the decay curve of I-131; How many milligrams of I-131 will be remain after 3 half-lives? 20 15 1 half-life Amount of I-131 (mg) 10 2 half-lives UI 3 half-lives 4 half-lives 5 half-lives O 0 8 16 24 32 40 Time (days) A) 20mg B) 2.5 mg C) 1.25 mg D) 5 mg