To determine whether the two angle measurements can be supplementary, we need to check if the sum of the angles \( m∠A \) and \( m∠B \) equals 180°.
Given:
- \( m∠A = 37° \)
- \( m∠B = 143° \)
Now, let's calculate the sum: \[ m∠A + m∠B = 37° + 143° = 180°. \]
Since the sum of the angles equals 180°, this means that the angles are indeed supplementary.
The correct reasoning behind the answer is that they add up to 180°.
Thus, the correct answer is: b. Yes, they are a supplementary pair.