Answer:
Mollusks.
Step-by-step explanation:
The most important sensory organs in many organisms of phylum Mollusca are olfactory organs. In these organisms, olfactory receptors are highly developed. These organs are present on the tips of their tentacles and provide sense of smell.
Rhinophores are examples of olfactory organs in marine gastropods, protrude on the top of the head.
Thus, the correct answer is option). mollusks.