TMUA 2019 Paper 2 Question 17

A multiple-choice question offered the following four options relating to a certain statement: $$\text{A: true if and only if }x>1;\text{B: true if }x>1;$$ $$\text{C: true if and only if }x>2;\text{D: true if }x>2.$$ Given that exactly one of these options was correct, which one was it?