The figure shows the number of particles \( N t \) emitted per second by a radioactive source as...

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The figure shows the number of particles \( N t \) emitted per second by a radioactive source as a function of time \( t \)
The relationship between \( N_{t} \) and \( t \) is
(A) \( N_{t}=1000 \mathrm{e}^{-(20 t / s)} \)
(B) \( N_{t}=20 \mathrm{e}^{-(20 t / s)} \)
(C) \( N_{t}=3 \mathrm{e}^{-(0.05 t / s)} \)
(D) \( N_{t}=20 \mathrm{e}^{-(0.05 t / s)} \)
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