Ayoung person from southern california has four german grandparents. she lived in los angeles all her life before accepting a job in milwaukee. she has never really thought about her german heritage, but in milwaukee she discovers many other people with similar ancestries and starts using her ethnicity as a way to develop social and professional relationships. what is this an example of

The answer is situational ethnicity. This is an ethnic individuality that can be either showed or hidden contingent on its practicality in a given situation. In other words, members of many groups have a way to have the fertility of an ethnic identity, deprived of alienation from the typical society. 

this doesn't support enough information to answer the question.

i would say b. research typically uses a variety of sources