Step 1: Ceiling vs current strength.
Article 81 provides a {maximum} of 552 (530 from States, 20 from UTs, and historically 2 Anglo-Indian nominees—now ceased). The current elected strength is 543.
Step 2: Avoid the trap.
Many aspirants pick 545 or 550 by confusing with historical counts; the question asks the {maximum}.
Step 3: Conclude.
\[
\boxed{\text{552 (Option C).}}
\]