Pteridophyta do not have (c) flowers.
Explanation: Pteridophytes, like ferns, have roots, stems, and leaves, but they lack flowers, which are a defining characteristic of flowering plants (angiosperms).
Why other options are incorrect:
(a) root: Pteridophytes have roots.
(b) stem: Pteridophytes have stems.
(d) leaves: Pteridophytes have leaves.