Final answer:
The most likely correct justification for statement 4 of the two-column proof is the substitution property of equality.
Step-by-step explanation:
The correct justification for statement 4 of the two-column proof depends on the specific proof being considered. However, out of the given options, the most likely correct justification is the substitution property of equality.
The substitution property of equality states that if two quantities are equal, then one can be substituted for the other in any equation or expression. In a two-column proof, this property is often used to substitute the value or expression from a previous statement into a later statement to show the logical flow of the proof.
Without further context or information about the specific proof, it is difficult to definitively determine the correct justification. However, the substitution property of equality is a commonly used property in mathematical proofs, so it is a reasonable choice.