When two lines intersect, opposite angles (also known as vertical angles) are equal. In this case, angles 2 and 4 are opposite each other, and angles 1 and 3 are opposite each other.
Given that \( m∠2 = 112° \), angle 4, which is opposite to angle 2, also has the same value. Therefore, \( m∠4 = 112° \).
The correct answer is:
∠4