Solution:

Ans. Option c) is correct. 
Leucosolenia and Spongilla belong to Porifera. They have porous body and are diploblastic. 

Phylum Porifera

General features of phylum Porifera:

• They are mostly marine and non-motile.

• They are mostly found attached to rocks.

• They show cellular level of organization. Their body is not organized into tissues and organs.

• Their bodies are porous. Their bodies has holes or pores all over, which allows the circulation of water throughout the body and bring in food and oxygen.