Carefully study the information below about the cell cycle of a particular multicellular eukaryotic organism.
 Given the data, how long is the cell cycle for these cells?
 It takes 3 hours for the nucleus to divide and 1 hour for the cytoplasm to divide.
 After 8 hours, the cell will start dividing again.
 It takes 2 hours for the cell to copy its genetic material.
 a. 1 hour
 b. 4 hours
 c. 8 hours
 d. 12 hours