Option A. Groups of sporangia (plural: sporangium) that contain spores are referred to as sori (plural: sorus). Sori are often located on the blade's underside. Young sori are frequently covered with tissue flaps known as indusia (singular: indusium).
Sori can be extended significantly, round, oval, or oblong in shape. They might happen close to the pinna's edge or farther away from it. You can observe that the sori are made up of countless little, spherical bodies called sporangia using a 10x hand lens. A group of sporangia is called a sorus. There is an annulus inside each sporangium. The indusium is a protective coating that occasionally sori have. Filicales' life cycle (Ferns).
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