A vessel less piece of stem possessing prominent sieve tubes would belong to

A vessel less piece of stem possessing prominent sieve tubes would belong to Trochodendron.

The species of Trochodendron genus have a very unique feature of the angiosperms, i.e., it lack vessel (trachea) elements in its wood, but has prominent sieve tube cells. This is quite unusual for flowering plants.

Hence the correct answer is option (d).