Which Amount of Radioactivity Is Equivalent to 4 $\mu$ Ci

Which amount of radioactivity is equivalent to 4.1 × 10¹² disintegrations/s?

A) 1.1 × 10³ Ci
B) 4.1 × 10⁹ Bq
C) 4.1 × 10¹² Bq
D) 1.1 × 10¹⁰ $\mu$ Ci