In the Roderick family, the older son is a college sophomore, while the younger son is a senior in high school. The older son is already thinking about what job he will get after college to help his family. Although the younger son will be heading to college soon, the parents still spend most of their time focused on how their older son is doing academically. What statement describes the cause for sibling rivalry between both brothers?

The older son shared his fears about providing financial support for the family after graduating.
The sons challenged each other by competing for the highest grade point average that year.
The younger son expressed feelings about his parents showing favoritism to his older sibling.
The sons disagreed over the handling of family tasks once the younger son heads off to college.