Exhibit 19-2 the Following Question(s) Pertain to a 450 Gram Sample of Sample

Exhibit 19-2
The following question(s) pertain to a 450 gram sample of ⁶⁰Co recovered from a decommissioned nuclear reactor. An activity of 1.11×10¹³ Bq was measured by technicians dismantling the plant.
Refer to Exhibit 19-2. The activity of the sample was measured a year later and found to be 9.73×10¹² Bq. What is the decay constant?

A) 0.132 d^-1
B) 0.0572 d^-1
C) 3.12 d^-1
D) 0.319 d^-1