When Counting on Her Own, Josie Can Accurately Count 5

When counting on her own, Josie can accurately count 5 objects. When her father helps her by pointing at each object to be counted, Josie can accurately count 10 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.