Step 1: Recall the definition of Gross Command Area (GCA).
Gross Command Area is the total area enclosed within the irrigation project boundary.
It includes:
- Cultivable land
- Uncultivable land (roads, villages, forests, rivers, etc.)
Step 2: Identify the correct option.
Hence,
\[
\boxed{\text{Gross Command Area (GCA)}}
\]
is the correct answer.
Therefore,
\[
\boxed{(C)}
\]
is the correct answer.