To calculate the Curved Surface Area (C.S.A) of a hemisphere, use the formula:

\[
\text{C.S.A} = 2 \pi r^2
\]

where \( r \) is the radius of the hemisphere.

Given:
- Radius \( r = 1.75 \, \text{cm} \)

1. Calculate the C.S.A:

\[
\text{C.S.A} = 2 \pi (1.75)^2
\]

\[
(1.75)^2 = 3.0625
\]

\[
\text{C.S.A} = 2 \pi \times 3.0625
\]

\[
\text{C.S.A} = 2 \times 3.1416 \times 3.0625
\]

\[
\text{C.S.A} \approx 19.25 \, \text{cm}^2
\]

The correct answer is:

B. 19.25 cm²