Final answer:
Barnabas used the allegorical method of interpretation to support Judaism, seeking deeper meanings in scripture to harmonize Jewish and Christian beliefs. So, the correct answer is option 2.
Step-by-step explanation:
Barnabas utilized the allegorical method of Scripture interpretation to support Judaism. This approach to interpreting scripture does not take the text literally but seeks deeper, spiritual meanings behind the words, often to draw connections between one's faith and historical texts.
Barnabas, as a Jewish Christian, used this method to find harmony between Christian teachings and the Jewish tradition, viewing Christ as a continuation and fulfillment of Jewish prophecy, rather than as a repudiation of Judaism.
So, the correct answer is option 2.