Imani, Age 11 Months, Is Wary of Strangers

Imani, age 11 months, is wary of strangers. However, when his mother sits on the floor, Imani ventures a few feet away from her for a few minutes at a time, and then returns to her for emotional support. Imani is

A) engaging in effortful control.
B) exhibiting unusual behavior for a toddler with stranger anxiety.
C) using his mother as a secure base.
D) displaying avoidance rather than approach.