Answer: (A) Ethnic boundary markers
Step-by-step explanation:
According to the given question, the given situation is best illustrating the concept of Ethnic boundary markers as it is one of the social interaction process that helps in maintain the culture, religion and the traditions.
On the basis of the given Jewish culture, language and the traditions the person are basically represent as "Jewish" because of these given custom set.
The ethnic boundary markers is basically describe about the various types of characteristics related to the ethnic group and by using these characteristics such as language, name the people are signify to the specific group within some ethnic boundaries.
Therefore, Option (A) is correct answer.