Scientists Isolate Cells in Various Phases of the Cell Cycle

Scientists isolate cells in various phases of the cell cycle. They isolate a group of cells that have 1 1/2 times more DNA than G₁ phase cells. What is the most likely part of the cell cycle from which these cells were isolated?

A) between the G₁ and S phases in the cell cycle
B) in the G₂ phase of the cell cycle
C) in the M phase of the cell cycle
D) in the S phase of the cell cycle