Why is variation beneficial to species but not necessarily for the individual?

• All species have distinct spaces in the biological system. Assuming any uncommon change happens in that specialty, those species will either advance or will be killed by that environment. 
• The effect of that extreme change will be equivalent to each individual of that species, that is, they might get developed and get normally chosen for species, including varieties inside the populace. 
• A portion of the variations could possibly adapt to the change, in this manner, get a benefit for survival, however, others won't survive. In this way, the variations help in the survival of species.

Hence, option A is the correct answer.