This would be referred to as "Imprinting," as in reference to Zoology specifically (of a young animal) come(s) to recognize (another animal, person, or thing) as a parent or other object of habitual trust.
Socializing is simply communicating, therefore, it does not match.
Priming is to prepare something, as in an object. I do not believe it would necessarily be directed toward a person unless it was creative writing. So this does not fit either.
Sensitizing means to make something or someone react to something in particular. For an example, your pupils will react (become sensitive) when you look into the light of the flashlight. It is a forceful reaction and thus does not fit for the above question.
Good luck and remember never just look for the correct answer; understand why it is the correct answer.