m < 4 is the external angle of the triangle, and its adjacent interior angle, m < 2 is its supplement (the sum of their measures add up to 180°.
The Exterior Angle Theorem states that the measure of each exterior angle of a triangle is equal to the sum of the opposite and non-adjacent interior angles.
Remember that the two non-adjacent interior angles opposite the exterior angle are sometimes referred to as remote interior angles.
Therefore, the remote interior angles in this case are < 1 and < 3. Their sum is equal to m < 4.
Therefore, the correct answer is Option B) m < 1 + m < 3.
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