When Counting on Her Own, Josie Can Accurately Count Five

When counting on her own, Josie can accurately count five objects. When her father helps her by pointing at each object to be counted, Josie can accurately count ten objects. Her father's assistance is:

A) outside of Josie's zone of proximal development.
B) within Josie's zone of proximal development.
C) likely to result in Josie becoming uninterested in counting.
D) likely to slow the pace of Josie's ability to count accurately on her own.