Consider the following four statements (I - IV) related to cell cycle, and select the correct option stating them as true [T] and false [F]. i. `G_1` phase is a metabolically active stage of the cell cycle. ii. Interphase is the phase of actual cell division. iii. The number of chromosomes doubles in S-phase. iv. The cells that do not divide further exit the `G_1` - phase to enter a quiescent stage.

Options

A. `{:(I,II,III,IV),(T,F,F,F):}`
B. `{:(I,II,III,IV),(F,T,T,T):}`
C. `{:(I,II,III,IV),(F,F,T,T):}`
D. `{:(I,II,III,IV),(T,F,F,T):}`

Answer

To solve the question, we will evaluate each of the four statements related to the cell cycle and determine whether they are true (T) or false (F).

### Step-by-Step Solution:

1. **Evaluate Statement I: `G_1` phase is a metabolically active stage of the cell cycle.**
- The G1 phase is indeed a metabolically active stage where the cell grows and performs its normal functions. Therefore, this statement is **True (T)**.

2. **Evaluate Statement II: Interphase is the phase of actual cell division.**
- Interphase is the period of the cell cycle when the cell is not dividing; actual cell division occurs during the M phase (mitotic phase). Thus, this statement is **False (F)**.

3. **Evaluate Statement III: The number of chromosomes doubles in S-phase.**
- During the S phase, DNA replication occurs, which means the amount of DNA doubles, but the number of chromosomes does not change. Therefore, this statement is **False (F)**.

4. **Evaluate Statement IV: The cells that do not divide further exit the `G_1` phase to enter a quiescent stage.**
- Cells that exit the cell cycle and do not divide further enter a quiescent stage known as G0 phase. This statement is **True (T)**.

### Summary of Evaluations:
- Statement I: True (T)
- Statement II: False (F)
- Statement III: False (F)
- Statement IV: True (T)

### Final Answer:
The correct option stating the truth values of the statements is:
- I: T
- II: F
- III: F
- IV: T