The novelty and brilliant insight of Darwin was that he asserted that variations, which are ______W_______and which make resource utilisation better for few will enable only those to reproduce and leave______X_______. Hence over a period of time there would be ______Y_______in population characteristic and hence______Z_______appear.

In the above paragraph, W, X, Y, and Z respectively are:
 

• A

  Heritable, less progeny, a change, no new forms
• B

  Non-heritable, more progeny, a change, new forms
• Correct answer
  C

  Heritable, more progeny, a change, new forms
• D

  Heritable, less progeny, no change, no new forms

Hence, the correct answer is option: 'C'.