Answer:
B. Cellular respiration
Step-by-step explanation:
The cellular process that is occurring in the organelle labeled B is "Cellular respiration".
From the image, the organelle B is Mitochondria. Cellular respiration takes in the mitochondria and this is important because it leads in the production of ATP using the chemical energy that is found in glucose and other nutrients.
Mitochondria are known to be membrane-bound organelles. Their function is to generate most of the chemical energy that the cell needs for biochemical reactions.