Explanation:
B) mitochondria
In all eukaryotic cells mitochondria are small cellular organelles bone by membranes views make most of the chemical energy required for powering the biochemical reactions within the cell. This chemical energy is stored within the molecule ATP which is produced through the process of respiration during cellular metabolism altogether the complex reactions that lead to ATP production are called the citric acid cycle. Thus active muscles would contain more mitochondria in order to meet their higher metabolic demands and produce more energy for locomotion.
Learn more about mitochondria https://brainly.com/question/8427362
Learn more about mitochondria and similar structures https://brainly.com/question/2855039
#LearnWithBrainly