In early civilizations, the development of early calendar systems—motivated most often by the desire to improve crop production—often coincided with the advancement of mathematics and astronomy. Granted, the practice of studying celestial bodies also gave rise to astrology and religion, which often had the effect of slowing the progress of the former two areas. Nevertheless, the inhibiting effect of astrology and religion is unlikely to have a lasting impact on mathematical and astronomical progress. Therefore, in all likelihood, the advancement of agrarian science, by motivating the development of measuring seasons and time, led to improved understanding of mathematics and astronomy in early civilizations.
In the argument given, the two boldfaced portions play which of the following roles?
【选项】
The first is evidence that has been used to support a conclusion that the argument questions; the second is the main conclusion of the argument.
选项是否正确？