help please

Theorem: The negative of every irrational number is irrational. Proof: 1. Suppose there is some irrational number p such that -p is rational. 2. -p = min, where m and n are both integers and n # 0 3. p = -min, where -m and n are both integers and n # 0 4. p is rational, which is contradiction Which of the following best describe the contradiction in the above proof by contradiction? Line 4 contradicts line 1 Line 4 contradicts line 2 Line 3 contradicts line 1 OLine 3 contains the entire contradiction