Paul's letter written to combat heresy of the judaizers is:
galatians
romans
corinthians
thessalonians

For the answer to the question above, Paul's letter written to combat heresy of the Judaizers is written in the book of Galatians. Judaizers are People who pray out to public loud and sound like professional in praying but their hearts are empty and away from the Lord.

Hello there.

Paul's letter written to combat heresy of the Judaizers is:
Galatians

It's most likely choice a, it makes the most sense in my opinion.