Answer: Second option is correct.
Explanation:
Since we have given that
m∠1 = 40°
As we know that the measure of the central angles that intercepts the arc is equal to the measure of that arc of the circle.
And AB is the intercepted arc and the measure of the central angles that intercept the AB arc = 40°.
So, Measure of an arc AB = m AB = 40°.
Hence, Second option is correct.