How has the family and family sizes changed?

The 2010 Census enumerated 308.7 million people in the United States, a 9.7 percent increase from 281.4 million in Census 2000. Of the total population in 2010, 300.8 million lived in 116.7 million households for an average of 2.58 people per household.

They are both unlikely.  certain would be 100%, likely would be anywhere above 50%, and unlikely would be under 50%can i have brainliest, ?

Iam pretty sure it is c.