Answer:
D (50 grams)
Explanation:
As one half life is the time taken for half of a radioactive sample to decay.
When one half-life has occurred - we are left with [tex]\frac{1}{2}[/tex] of 200g, which is 100g.
Now another half-life occurs, which then decays [tex]\frac{1}{2}[/tex] of our remaining amount, so our 100g of Tritium decays into 50g.
