Classical criticism comes first.
It includes critics such as Plato, Aristotle, Horace, and Longinus.
Augustan criticism came later in the eighteenth century.
Romantic criticism came after Augustan criticism.
Poststructuralism belongs to the twentieth century and comes last among the given options.
Therefore, the chronological order is:
\[
\text{Classical Criticism}
\rightarrow
\text{Augustan Criticism}
\rightarrow
\text{Romantic Criticism}
\rightarrow
\text{Poststructuralism}.
\]
So the correct sequence is:
\[
D,\ C,\ B,\ A.
\]