Most biologists argue that the regulation of gene expression is considerably more complex in eukaryotes than in bacteria. list the four factors that in your view make the largest contribution to this perception. select the four correct statements.

I found the exercise on the internet and these are the statements mentioned above:
"1.The coordinated regulation of sets of genes devoted to a single function (e.g. metabolic pathways) allows minimal wasting of a cell's resources on unneeded proteins and metabolites.
2.Multicellularity and cell-type specificity is frequent in eukaryotes and requires organisms to regulate large suites of genes in a cell-type-specific manner.
3.The chromatin structure of eukaryotic genomes allows the differential packaging of genes to be used in regulation.
4.Posttranslational processing of proteins allows cells to regulate the function of proteins after their synthesis by covalent modification, transport, or both.
5.The extensive use of attenuation allows eukaryotes to fine-tune transcriptional activity of a cell according to environmental signals.
6.Eukaryotic cells possess a nucleus, which separates transcription from translation and allows RNA processing and transport to be used in regulation."

The correct four statements are: 1.; 2.; 3.; 6.
The other statements are not related to the complexity of gene expression regulation in eukaryotes compared to bacteria. The statement 4. is about the processing of proteins, a different matter to the regulation of gene expression. The statement 5. mentions a process that happens with prokaryotes - attenuation - and not eukaryotes. 

The answer would be d. pili