Which structure is found in all eukaryotic cells. a: large central vacuole b: golgi apparatus c: flagella d: cilia

B. Golgi Apparatus.

All eukaryotes have a Golgi apparatus though not all have the other organelles named above. They all have it because of it's indispensable function, transportation of lipids and the preparation for secretion an secretion of proteins.

The other part mentioned have important functions but that varies from cell to cell according to their functions.

Hope it helped,

BioTeacher101

Golgi Apparatus  

A prokaryotic cell, a eukaryotic cell has a plasma membrane, cytoplasm, and ribosomes. However, unlike prokaryotic cells, eukaryotic cells have: a membrane-bound nucleus. numerous membrane-bound organelles (including the endoplasmic reticulum, Golgi apparatus, chloroplasts, and mitochondria)

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.