Step 1: Structural rule.
By NITI Aayog’s composition, the {Prime Minister of India} is the {ex officio Chairperson}.
Step 2: Apply current officeholder.
Therefore the Chairperson is Narendra Modi. S. K. Bery serves as Vice-Chairman; Nirmala Sitharaman is Finance Minister; Shaktikanta Das is RBI Governor.
Step 3: Conclude.
\[
\boxed{\text{Narendra Modi (Option C).}}
\]