Solve now i will mark brainlest if solved if line a is parallel to line b, line b is parallel to line c then line a should be perpendicular to line c

No, all three lines are parallel. If line c was perpendicular to the line a, and because line b is parallel to the line a, both line a and b would be perpendicular to the line c (line b has to be parallel to the line c, therefore it's impossible)