Dry fruit that breaks up into single seeded parts is
Schizocarpic fruits are the dry fruits which upon maturing with divide into single-seeded indehiscent parts known as mericarps. They are also called splitting fruits.
Achene is a dry, indehiscent fruit that does not divide further.
Capsular fruits are dehiscent fruits that rupture to disperse several seeds.
Etaerio of achenes is a aggregate fruit, each fruit is an achene.
So, the correct answer is 'Schizocarpic'.