Fermium-253 Has a Half-Life Of $3.00$ Days a Sample of Fermium Has

Fermium-253 has a half-life of $3.00$ days. A sample of fermium has $3.88 \times 10 ^ { 6 }$ nuclei. What is the initial activity of this sample?

A) $10.4 \mathrm { kBq }$
B) $12.9 \mathrm {~Bq}$
C) $10.4 \mathrm {~Bq}$
D) $12.9 \mathrm { kBq }$