Final answer:
The presence of promoters of genes expressed in the liver is present in liver cells.
Step-by-step explanation:
The correct answer is d. promoters of genes expressed in the liver.
Enhancers are short DNA sequences that can regulate gene expression by increasing the efficiency of transcription. Promoters, on the other hand, are specific DNA sequences that signal the start of transcription. In the case of liver cells, they have promoters for genes that are expressed in the liver, not genes expressed in the kidney. Therefore, option d is correct.