Answer:
A. 
Step-by-step explanation:
This takes alot of extended research before you even think about using the drug on patients.
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You will get both of the fractions over the same denominator, so it will be 27/63 and 56/63, then you will add the two numerators, so it will then come out to 83/63, and you will then simplify that by subtracting 63 from 83, and will get 1 20/63