Final answer:
The people in Romans and Corinthians were either former military or descended from legionnaires. Paul's use of military language would have resonated deeply with them.
Step-by-step explanation:
The correct answer is a) Romans and Corinthians. The reason there is so much military imagery in Romans and Corinthians is because the people in those cities were either former military or descended from legionnaires. The Roman military played a significant role in integrating provincial subjects into Roman culture, and military service was highly valued in Roman society. Roman soldiers were inspired by the cultural importance placed on winning military glory, and military families were common. Paul's use of military language would have resonated deeply with the people in these cities.