Answer:
D) The number of mitochondria has decreased due to long period of rest
Step-by-step explanation:
The cell organelles perform various functions in a cell. For example, the nucleus contains the genetic material of the cell, the ribosome function in protein synthesis, the mitochondria is the site for ATP synthesis, etc.
An athlete such as a basketball player requires a lot of energy for his/her activities. This energy is provided through the contraction and relaxing of muscle fibres. The mitochondria, the cell organelle required for energy synthesis will be present in very large numbers in the athlete's muscle cells in order to provide him/her with the required energy.
However, in the case of an injured athlete who has been out of action for 6 months, there would be a reduction in the number of mitochondria in the muscles due to this long period of inactivity.
Therefore, the correct option is D; The number of mitochondria has decreased due to long period of rest.