An ascocarp, or ascoma, is the fruiting body (sporocarp) of an ascomycete phylum fungus. It consists of very tightly interwoven hyphae and may contain millions of asci, each of which typically contains four to eight ascospores. Ascocarps are most commonly bowl-shaped (apothecia) but may take a spherical (cleistothecia) or flask-like (perithecia) form, while a cleistothecium is a globose, completely closed fruit body with no special opening to the outside. The ascomatal wall is called as peridium and may typically consist of densely interwoven hyphae or pseudoparenchyma cells. It may be covered with hyphal outgrowth called as appendages. We can say that a closed asocarp is a cleistothecium. Thus, the correct answer is option D.