The enthusiastic acceptance of ascetic lifestyles evidenced in the surviving writings of monastic authors indicates that medieval societies were much less concerned with monetary gain than are contemporary Western cultures.
Conclusion
Medieval societies were much less concerned with money than contemporary Western cultures.
Evidence
Surviving writing from monks who lived in medieval societies show that these monks enthusiastically accepted an ascetic lifestyle of minimal subsistence.
Evaluation
Whoa, LSAC, when did this become a vocab / outside knowledge test? This is a pretty clear Sampling flaw, but it'll be hard to see it if you don't know what monastic and ascetic mean.
Monastic = monastery = where priests / monks / bishops lived Ascetic = forsaking money and material goods for a bare, minimal, austere, spartan existence.
This is an extremely biased sample. Monks are known to live an ascetic lifestyle. But they're the weirdos of society (no offense, monks). They're not representative of society.
This would be like a human anthropologist a thousand years from now saying,
Goal
Look for an answer suggesting that the devotional religious types at a monastery aren't necessarily the most representative members of society, from which to base a generalization about that society.