Which of the following describes cellular activities?

The correct answer relates to the idea that cellular activities encompass a range of processes that are essential for the survival and functionality of a cell, including reproduction. Cellular activities involve not only the processes necessary for reproduction, such as cell division and the genetic material exchange, but also a variety of other vital functions like metabolism, energy production, protein synthesis, and waste elimination.

While it’s true that cellular activities include chemical reactions as part of metabolic processes, simply stating that they are "only chemical reactions" would overlook the broader spectrum of activities occurring within a cell. Similarly, physical transport of nutrients is just one aspect of cellular operations and does not capture the complexities involved, such as the regulation of these processes and the interactions between different cellular components. Thus, option A is correct as it includes vital processes like reproduction that are indeed a part of cellular activities while acknowledging the broader role of various other processes as well.