In ancient times, people used different units of measurement of length and distance. Some of them are
P. Cubit Q. Footstep
R. Handspan S. Arm length
The correct arrangement in terms of their increasing length is

Options

A. R, Q, P, S
B. R, P, Q, S
C. R, P, S,Q
D. R, S, P, Q

Explanation

To solve the problem of arranging the ancient units of measurement in increasing length, we will analyze each unit step by step.

### Step 1: Understand Each Measurement
1. **Cubit (P)**: The distance from the elbow to the tip of the middle finger.
2. **Footstep (Q)**: The distance from the heel to the toe of a foot.
3. **Handspan (R)**: The distance between the thumb and the little finger when the hand is fully stretched.
4. **Arm Length (S)**: The total length of the arm from the shoulder to the tip of the middle finger.

### Step 2: Compare the Lengths
- **Handspan (R)** is the smallest measurement because it only involves the width of the hand.
- **Footstep (Q)** is generally longer than a handspan since it measures the length of a foot.
- **Cubit (P)** is longer than a footstep because it measures from the elbow to the tip of the middle finger, which is a longer distance.
- **Arm Length (S)** is the longest measurement as it encompasses the entire length of the arm.

### Step 3: Arrange in Increasing Order
Based on the comparisons:
1. Handspan (R) - smallest
2. Footstep (Q) - next
3. Cubit (P) - larger than footstep
4. Arm Length (S) - largest

### Final Arrangement
Thus, the correct arrangement in terms of increasing length is:
**R (Handspan) < Q (Footstep) < P (Cubit) < S (Arm Length)**