To solve this problem, we need to match the phases and stages of the cell cycle in List I with their corresponding descriptions in List II. Let's analyze each item:$\newline \bullet$a. S phase:$\newline$ - The S phase, or synthesis phase, is the part of the cell cycle in which DNA replication occurs.$\newline$ - This matches with iv.$\newline \bullet$b. G$_2$ phase:$\newline$ - The G$_2$ phase is the period after DNA synthesis has occurred but before mitosis. During this phase, proteins are synthesized in preparation for mitosis.$\newline$ - This matches with i.$\newline \bullet$c. Quiescent stage:$\newline$ - The quiescent stage, also known as the G$_0$ phase, is a resting phase where the cell is not actively preparing to divide. It is considered an inactive phase.$\newline$ - This matches with ii.$\newline \bullet$d. G1 phase:$\newline$ - The G1 phase is the interval between mitosis and the initiation of DNA replication. It is a period of cell growth.$\newline$ - This matches with iii.$\newline$Now, let's match the items from List I with List II:$\newline a \rightarrow iv, b \rightarrow i, c \rightarrow ii, d \rightarrow iii \newline$This corresponds to Option 3.