Here's my mind map and rationale.
Mind Map: Renaissance scholars mastered Roman Literature, their contemporaries had poor knowledge. Later the reasons for their lack of knowledge (in comparison to scholars) is explained.1. The passage is primarily concerned with discussing theA) unsuitability of the Roman classics for the teaching of morality
Suitability is never discussedB) approach that sixteenth-century scholars took to learning the Roman classics
The scholar themselves never took any approachC) effect that the Roman classics had on educated people in the Renaissance
Effect on educated people in Renaissance not discussedD) way in which the Roman classics were taught in the sixteenth century
Fits the bill. As line 4 & 5 say that they gained knowledge based on what was taught is schoolE) contrast between the teaching of the Roman classics in the Renaissance and the teaching of the Roman classics today
OOS2.The information in the passage suggests that which of the following would most likely result from a student’s having studied the Roman classics under a typical sixteenth-century teacher? I got this wrong 
A) The student recalls a line of Roman poetry in conjunction with a point learned about grammar.
Did not find anything about grammarB) The student argues that a Roman poem about gluttony is not morally offensive when it is understood in its historical context.
Selected this based on POEC) The student is easily able to express thoughts in Latin.
This ability is not discussedD) The student has mastered large portions of the Roman classics.
180 degree answerE) The student has a sophisticated knowledge of Roman poetry but little knowledge of Roman prose.
Incorrect. OOS3. Which of the following, if true, would most seriously weaken the assertion made in the passage concerning what a modern reader cannot know?This reference can be found in the last line of the para. Basically we need evidence that will weaken the claim that modern reader cannot know the associations that a line had on educated sixteenth-century reader. Also we were told about a technique that was used to teach the educated people.A) Some modern readers are thoroughly familiar with the classics of ancient Roman literature because they majored in classics in college or obtained doctoral degrees in classics.
Does not help us understand the method and text that were used to teach people in 16th centuryB) Some modern readers have learned which particular works of Roman literature were taught to students in the sixteenth century.
Still does not help us identify the exact text & technique usedC) Modern readers can, with some effort, discover that sixteenth-century teachers selected some seemingly dangerous classical texts while excluding other seemingly innocuous texts.
Irrelevant. OOSD) Copies of many of the classical texts used by sixteenth-century teachers, including marginal notes describing the oral lessons that were based on the texts, can be found in museums today.
Bang on. If we able to get our hands on the notes used to teach people we can study from it and understand things the way they did in 16th centuryE) Many of the writings of the best sixteenth-century Renaissance scholars have been translated from Latin and are available to modern readers.
Writing of 16th century scholars are irrelevant