can you explain plz why the first answer is wrong?! it is reflexive and antisymmetric but not transitive, while the second answer has all the relations applied so it is a partial order while the first one is not

thanks in advance

Which of the following is not a partial order on the set {a,b,c} ? Selected Answer: {(a,a),(b,b),(c,c)} Correct Answer: {(a,a),(a,c),(c,a),(b,b),(c,c)}