If Vector $\vec { B }$ Is Added to Vector $\overrightarrow { \mathrm { A } }$

Multiple Choice

If vector $\vec { B }$ is added to vector $\overrightarrow { \mathrm { A } }$ ,the result is $6 \tilde { \mathbf { i } } + \hat { \mathbf { j } }$ .If $\vec { B }$ is subtracted from $\overrightarrow { \mathrm { A } }$ ,the result is $$- 4 \tilde { \mathbf { i } } + 7 \tilde { \mathbf { j } }$$ .What is the magnitude of $\overrightarrow { \mathrm { A } }$ ?

A) 5.1
B) 4.1
C) 5.4
D) 5.8
E) 8.2