Pigment containing membranous extension in some cyanobacteria are :

The correct option is D Chromatophores
The plasma membrane of cyanobacteria gives out extensions known as chromatophores. They contain various photosynthetic pigments necessary for performing photosynthesis. These pigments are chlorophyll a, carotenes, and xanthophylls.

A heterocyst is a differentiated cyanobacterial cell that carries out nitrogen fixation. The heterocysts function as the sites for nitrogen fixation under aerobic conditions. They are formed in response to a lack of fixed nitrogen.

Basal bodies are protein‐based structures located at the base of cilia which are thought to provide a platform on which the cilium is constructed. The basal body is a modified form of the centriole, an organelle that is found at the core of the mitotic spindle pole.

Pneumatophores are specialized root structures that grow out from the water surface and facilitate the aeration necessary for root respiration in halophytic trees such as many mangrove species.