In order to improve the combat effectiveness of future generations, Spartak people have to perform physical fitness tests on newborn babies. They place born babies in harsh natural environments such as ravines, water, and fields to test their vitality. Abandon those who are weak and can't stand the test, and leave those who are strong and viable. However, this method did not make the Spartak city-states last long, but declined before the hostile Athens. Based on the above, which of the following is the most appropriate reason for Spartak's failure to select talents? ? ['Newborn babies have good physical fitness, they may not necessarily be the strongest in combat when they grow up.', "Physiological quality is only part of a person's overall quality.", 'Talents are selected, but Spartak has too little population, so it is impossible to escape the failure of failure.', 'Talent selection in Athens may be harsher than Spartak.']