Organisms are given in below box
Primitive metazoans, Primitive eukaryotes, Scanty fossils, Prokaryotes
All of above belongs to
Azoic Era
Proterozoic Era
Cenozoic Era
Mesozoic Era
As we learn
Proterozoic Era -
Era of Early life
- wherein
Primitive metazoans, primitive eukaryotes, scanty fossils, prokaryotes
Correct option is 2