The Eastward Component of Vector $\vec { A }$ Is Equal to the Westward Component of Vector

The eastward component of vector $\vec { A }$ is equal to the westward component of vector $\overrightarrow { \mathbf { B } }$ and their northward components are equal. Which one of the following statements must be correct for these two vectors?

A) Vector $\vec { A }$ is parallel to vector $\overrightarrow { \mathbf { B } }$ .
B) Vector $\vec { A }$ is antiparallel (in the opposite direction) to vector $\overrightarrow { \mathbf { B } }$ .
C) Vector $\vec { A }$ must be perpendicular to vector $\overrightarrow { \mathbf { B } }$ .
D) The magnitude of vector $\vec { A }$ must be equal to the magnitude of vector $\overrightarrow { \mathbf { B } }$ .
E) The angle between vector $\vec { A }$ and vector $\overrightarrow { \mathbf { B } }$ must be 90°.

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