Step 1: Recall the Permanent Settlement Act.
The Permanent Settlement Act was introduced in \(1793\) by Lord Cornwallis in Bengal, Bihar, and Orissa during British rule in India.
Step 2: Understand the main objective.
The primary objective of the system was to ensure a fixed and regular source of land revenue for the British Government.
Under this system, zamindars were recognized as landowners and were made responsible for collecting revenue from peasants and paying a fixed amount to the British administration.
Step 3: Analyze the options.
(A) Abolition of the ryotwari system: Incorrect, because the ryotwari system was introduced later in other regions of India.
(B) Establishment of peasant ownership of land: Incorrect, because ownership rights were mainly given to zamindars, not peasants.
(C) Securing land revenue for British Government: Correct, as this was the main aim of the settlement.
(D) Abolition of the zamindari system: Incorrect, because the system actually strengthened the zamindari system.
Step 4: Final conclusion.
Therefore, the Permanent Settlement Act of \(1793\) primarily aimed at
\[
\boxed{\text{securing land revenue for British Government}}
\]