Answer :
Cell Biology: Prokaryotic and Eukaryotic Cells
Given their structure, cells can be classified in the following way:
Prokaryotic cells: Those that don't have a nucleus or other organelles delimited by a membrane. The member of the domains Bacteria and Archaea have this type of cell.
Eukaryotic cells: These kinds of cells have their genetic material inside a nucleus, which is membrane-bound, and it also has other organelles such as mitochondria and endoplasmic reticulum. This type of cell can be found in multicellular organisms such as animals and plants.
They are subdivided into animal cells, plant cells, and fungi cells.
Animal cells don't have a cell wall, while plant cells have a cell wall made of cellulose, and fungi cells have a cell wall made of chitin.
Given that the cell observed by the student has a nucleus and organelles but no cell wall, the cell is an animal cell, so A is the correct answer.
