Answer:
a. Uses economic tools to examine political behavior.
Step-by-step explanation:
Public choice is a field that uses economics to analyze and understand situations related to the political science like behavior, for example, the analysis of voters' behavior using decision theory. According to this, the answer is that public choice is a field of study that uses economic tools to examine political behavioral.
The other options are not right because population growth and consumption chooices are not related to political science and public choice uses economic tool not mathematics and statistics.