31) A

1 – Correct
Aspiring can reduce the risk of further trouble after heart attack but it can also induce internal bleeding and carries a slight risk of cerebral haemorrhage. So it is a matter of balancing risks and benefits.

2 – Wrong
80% reach the threshold by 50. The other 20% do not. so we cannot conclude statement 2.

3 – Wrong
No information is given about the relative risk of heart attack in men aged 40 compared to men aged 50.

Since only statement 1 is correct, A is the answer.

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