We know that a trapezoid is a quadrilateral and we also know that the sum of the four interior angles of a quadrilateral always equals
.
Now, it is given that 3 interior angles of a trapezoid are m∠B= 25°, m∠C = 155° and m∠ D= 117°. The sum of these three angles is:
25°+155° +117°=

Thus, the measure of the fourth interior angle,
will be:
=

Thus, out of the given options, Option B is the correct one.