Answer: Option 'B' is correct.
Explanation:
Since we have given that
∠1 = ∠4
∠2 = ∠3
And sum of the measures of the four angles = 140°
According to question, it becomes,

Measure of ∠3 is 8 less than the measure of ∠4.
Let the measure of ∠4 be 'x'.
So, the measure of ∠3 would be 'x-8'.
∠1 = x and ∠2 = x-8
So, put all the values in the above equation:

So,

So,

Hence, Option 'B' is correct.