Two Tiny Particles Carrying Like Charges of the Same Magnitude $1.0 \mathrm {~mm}$

Multiple Choice

Two tiny particles carrying like charges of the same magnitude are $1.0 \mathrm {~mm}$ apart. If the electric force on one of them is $5.0 \mathrm {~N}$ what is the magnitude of the charge on each of these particles?(k = 1/4??₀ = 9.0 × 10⁹ N ? m²/C²)

A) 2.4 × 10^-2 C
B) 2.4 × 10^-8 C
C) 4.5 × 10⁴ C
D) 2.4 × 10^-5 C