Is there more to this question? It seems incomplete.
Your image isn't clear so I couldn't see the proper option but lucky for you I have seen this question before so I will tell you the answer.
The answer is option D (facilitated diffusion).
The correct answer is: The cell is producing a large amount of proteins.
The nucleolus is the largest structure in the nucleus of eukaryotic cells with the main function in ribosome biogenesis. It includes the steps of ribosomal RNA (rRNA) transcription, pre-rRNA processing and ribosome subunit assembly.
Wait what please explain I'm so lost