Step 1: Understanding the Concept:
Dilution occurs when new shares are issued to outsiders, reducing the percentage ownership of existing shareholders.
Step 2: Detailed Explanation:
In a Rights Issue, the company offers new shares to its existing shareholders in proportion to their current holdings.
If the existing shareholders subscribe to these shares, their percentage ownership in the company remains unchanged.
IPO and FPO involve selling shares to the general public, which leads to dilution.
Step 3: Final Answer:
(C) Rights Issue