Discussion
The peculiar structure of a particular type of nodular anhydride that consists of slightly elongated, irregular polygonal masses of anhydrite separated by thin dark stringers of carbonate or clay minerals is referred to as :
Answer: C
The structure is called chickenwire structure.
Nodular anhydrite in which slightly elongated, irregular polygonal nodules are pressed together and separated by thin dark films of carbonate or clay looks like the mesh of chicken-wire fencing. It forms by displacive growth of anhydrite within sediment, typically in supratidal sabkha settings, and is a classic indicator of evaporitic conditions.
'Mesh wire structure' is not the established term, framboidal refers to raspberry-like clusters of pyrite microcrystals, and so the option combining the first two is also wrong.
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