Darwin's theory of Pangenesis shows similarity with the theory of inheritance of acquired characters. Which of the following is true regarding this?

• A
  Useful organs become stronger and develop,while disused organs disappear. These organs help in the survival of the fittest.
• B
  The size of organs increases with age.
• C
  Organs develop according to the will power of the organism.
• D
  There must be some physical basis for inheritance.