Find the Dot Product for the Pair of Vectors $- 7 \mathbf { j } , 2 \mathbf { i }$

Find the dot product for the pair of vectors.
- $- 7 \mathbf { j } , 2 \mathbf { i }$

A) $- 9$
B) 9
C) $- 5$
D) 0