31) A & C

The best way to solve this question is by expressing the four statements as inequalities.

A – Correct
Anne is not older than Susan. So Anne is either younger or is of the same age as Susan.
A ≤ S

B – Wrong
Susan is younger than Anne.
A > S

C – Correct
Susan is at least as old as Anne. So Susan is either older or is of the same age as Anne.
A ≤ S
D – Correct
Anne is not younger than Susan. So Anne is either older or is of the same age as Susan.
A ≥ S
A and C have the same inequalities. So A & C are the answers. 

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