[tex]E = k \times \frac{Q}{ {r}^{2} } | \times {r}^{2} \\ E {r}^{2} = k \times Q | \div k \\ Q = \frac{E {r}^{2} }{k } [/tex]
[tex] \boxed{ \boxed{Odp.B}}[/tex]
