Answer:
The correct option is 4.
Explanation:
If a transversal line intersect two parallel lines then the corresponding angles are congruent.
From the given figure it is clear that the transversal line t intersect the two parallel lines r and s. So, x° and 115° are corresponding angles because they have same relative position at both intersections.

On equating both the sides we get

The value of x is 115, therefore the correct option is 4.