Step 1: Compare pneumatic and hydraulic systems.
Pneumatic systems use compressed air, making them clean, safe, and suitable for light-duty applications.
Hydraulic systems use pressurized liquids and can generate much higher forces.
Step 2: Identify the correct statement.
Compared to hydraulic systems, pneumatic systems provide
\[
\boxed{\text{Cleaner operation and lower force}.}
\]
Therefore,
\[
\boxed{(C)}
\]
is the correct answer.