Baby jane has begun to develop a sense of trust. she expects that her mother willrespond when signaled. but jane does not protest when separated from hermother. in which of bowlby's phases does jane best fit

I believe the answer is: "attachment in the making" 
"attachment in the making" refer to the process of development when the infant started to attached themselves to the primary caregiver as a form of survival mechanism. On average, infants entered this phases when they're around 12 weeks - 6 months of age.