For a uniformly doped npn transistor, find the approximate emitter injection efficiency.
Given that:
$$N_{E}=2 \times 10^{18} cm^{-3}$$, $$N_{B}=10^{17} cm^{-3}, $$N_{C}=4 \times 10^{19} cm^{-3}, $$D_{E}=8 \frac{cm^{2}}{s}$$,$$D_{c}=28 \frac{cm^{2}}{s}$$, $$D_{B}=20 \frac{cm^{2}}{s}$$,$$ x_{E}=0.5 \mu m$$, $$x_{B}=0.3 \mu m$$

A

0.95

B

0.92

C

0.99

D

0.94