Step 1: Identify the Act.
The Constitution (106\textsuperscript{th}) Amendment Act, 2023—popularly the {Nari Shakti Vandan Adhiniyam}—provides 33% reservation for women in the Lok Sabha and State Legislative Assemblies.
Step 2: Key insertions.
It inserted Articles 330A and 332A to mandate reservation of seats for women in the LS and SLAs respectively, and Article 334A setting the review/sunset provisions and linking operationalization to delimitation.
Step 3: Eliminate distractors.
RTE (Art. 21A) came via the 86\textsuperscript{th} Amendment; Local Self Government was strengthened by the 73\textsuperscript{rd}/74\textsuperscript{th}; there’s no “international treaties” amendment by this number.
Step 4: Conclude.
\[
\boxed{\text{106th Amendment concerns {women's reservation} (Option B).}}
\]