Respuesta :
Organelles are the cellular structure that performs various functions. The organelle nucleus directs all the activities of the cell. Thus, option a is correct.
What is a nucleus?
The nucleus is an organelle present inside the cell and has the most vital role in the functioning and hereditary. It controls majorly all activities in the cell including growth, inheritance, metabolism, etc.
It is enclosed in a nuclear membrane that separates it from the cytoplasm and is the region where the process of replication and transcription takes place. It is the control center that directs and regulates the cellular activity that is essential for the cell to survive.
Therefore, a nucleus is an organelle that regulates cellular activities.
Learn more about nucleus here:
https://brainly.com/question/4932737
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