Step 1: Preamble descriptors.
India is declared to be a {Sovereign, Socialist, Secular, Democratic Republic}.
Step 2: Map options.
Since (A), (B), and (C) each appear in the Preamble, the comprehensive correct choice is (D) ``All of these.''
Step 3: Conclude.
\[
\boxed{\text{All of these (Option D).}}
\]