[单选题]
Q1 = 6.0 nC is at (0.30 m, 0);7pzw ,jz6rfbuusl 9to;n (i/6 Q2 = -1.0 nC is at (0,.bg.ovm ey (1ulb8j*s 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude of the net force on the 5.0 n.j(o b1b v*sumg8e y.lC charge?
A. $3.0 \times 10^{-6} \; N$
B. $4.5 \times 10^{-6} \; N$
C. $5.4 \times 10^{-6} \; N$
D. $7.2 \times 10^{-6} \; N$