The given figure shows the arrangement of vectors
-B is acting with a magnitude of 25 with [tex]30^0 to +X axis[/tex]
So vector B is along the opposite direction of vector -B
Statement A is wrong since the direction is opposite
Statement B is also wrong since it makes [tex]240^0 to +X axis[/tex]
Statement C is correct since it has 25 m magnitude
Statement D is wrong because vector's magnitude cannot be negative.
So option C is the correct answer.
