Mitochondria are found in c) both eukaryotic animal and plant cells.
Explanation: Mitochondria are known as the powerhouse of the cell, and they play a crucial role in energy production through cellular respiration. Both eukaryotic animal and plant cells contain mitochondria to convert nutrients into energy in the form of ATP. While prokaryotic cells, such as bacteria, do not have mitochondria, they perform energy production in different ways. Therefore, the presence of mitochondria is a defining feature of eukaryotic cells, encompassing both animals and plants.