Three Point Charges $- 2.00 \mu \mathrm { C } , + 4.00 \mu \mathrm { C }$

Three point charges, $- 2.00 \mu \mathrm { C } , + 4.00 \mu \mathrm { C }$ , and $+ 6.00 \mu \mathrm { C }$ , are located along the $x$ -axis as shown in the figure. What is the electric potential (relative to infinity) at point $\mathrm { P }$ due to these charges? $( k =$ $1 / 4 \pi \varepsilon _ { 0 } = 8.99 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 }$ )

A) $+ 154$ kV
B) $+ 307 \mathrm { kV }$
C) $- 307 \mathrm { kV }$
D) $0.00 \mathrm { kV }$
E) $- 154 \mathrm { kV }$