The Eastward Component of Vector $\overrightarrow { \mathrm { A } }$

Multiple Choice

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

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