By studying the suffix of “fallacy,” a reader can conclude it means

a mistaken belief, especially one based on unsound argument

Explanation:

study the parts of this word

fallacy

first part is fall. The greek root word for fall means to trick

acy. The greek root word for this is state of being

You can refer back to other words you know that end in "acy", then see how they relate to "fallacy"

examples: aristocracy, aliteracy, legacy

a source card is mage during research to tell the facts about the source one is using.

the correct answer can either be a or b because it could be both but you should probally choose b