In an Effort to Produce Nuclear Fusion You Fire a Deuterium

In an effort to produce nuclear fusion you fire a deuterium nuclei (q = + 1e,m = 3.34 * 10^-27kg) directly at another (fixed) hydrogen nucleus.How fast must you fire the deuterium for it to approach within 2.0 * 10^-15 m of the nuclei?

A) 8.3 * 10⁶ m/s
B) 5.4 * 10⁷ m/s
C) 1.4 * 10⁸ m/s
D) 1.9 * 10¹⁴ m/s
E) 2.1 * 101⁶ m/s