Eight identical droplets, each falling under gravity in the earth's atmosphere with terminal velocity `v`, combine to form a single drop. The terminal velocity of single drop and drag force on it are calculated. Find the correct statement from the following.

Options

A. `v`
B. `2v`
C. `3v`
D. `4v`

Explanation

To solve the problem, we need to analyze the situation where eight identical droplets combine to form a single larger droplet. We will derive the terminal velocity of the larger droplet based on the terminal velocity of the smaller droplets.

### Step-by-Step Solution:

1. **Understanding Terminal Velocity**:
The terminal velocity \( v \) of a droplet falling under gravity is given by the formula:
\[
v = \frac{2}{9} \frac{r^2 (\rho - \sigma) g}{\eta}
...