x = 75 , making solution B incorrect
The shape given in the question is a trapezoid.
To be able to answer the question, we need to understand an important interior angle property of trapezoids
The property is that angles on the same side of the trapezoid facing each other are congruent.
What this means in plain terms is that they are equal
In the case of this question;
2x = x + 75
Collecting like terms, we have;
2x - x = 75
x = 75
This shows that solution B is incorrect