Dr. Wang wants to administer an assessment with a new client who recently emigrated from Brazil and speaks only minimal English. After consulting with her colleagues, she finds a Portuguese version of the assessment that has been used a few times before. Before using the assessment, Dr. Wang should ensure .

that the measure has been tested and validated for use with Brazilians                    

Explanation:

Validity: In research, the term validity indicates the significance of particular research and how well & sound it is. It is being applied to methods as well as the design of particular research. Validity mainly determines the phenomenon of measurement and represents what it claimed to measure in specific research.

For any research or study to be successful the researcher should ensure the research is being validated or tested.

In the question above, Dr. Wang should ensure that the measure has been tested and validated for use with Brazilians before using the assessment.  

unless they converted, many non-christians (mainly jews and muslims) were persecuted

the answer would be in this answer. someone already asked the question.