C would be correct because 4/5 doctors would recommend this aspirin. If you divide 4 by 5, you would get 0.80 which also equals 80%
A won't be correct because the data didn't state that aspirins would 100% prevent heart attacks
B won't be correct because it states the fraction of the doctor's recoommendation, not providing any evidence of if it would or wouldn't help with heart attacks
