A Long Straight Wire Carrying a 4-A Current Is Placed $x$

A long straight wire carrying a 4-A current is placed along the $x$ -axis as shown in the figure. What wire? $\left( \mu _ { 0 } = 4 \pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } \right)$

A) $20 \mu \mathrm { T }$
B) $30 \mu \mathrm { T }$
C) $50 \mu \mathrm { T }$
D) $40 \mu \mathrm { T }$
E) $60 \mu \mathrm { T }$