a. Parents should have no legal right to determine who their children will marry.
b. Students in public schools should have the right to express themselves, so long as it does not pose a threat to others.
Explanation:
In this passage the author talks about the importance of individuality in society. He tells us that it is extremely important for a society to accept different ways of living and different interests. Variety and diversity should be encouraged as long as it does not damage others. Statements A and B describe situations in which this principle would be respected.