Which of these are grammatically correct?

Paolo is writing a personal narrative about how he overcame his fear of heights by riding a roller coaster. he is working on his thesis statement. which of the following sentences would be the best thesis statement?

Which of the following statements is true? minerals can be solids or liquids. minerals must have a homogeneous chemical composition. evaporites are a type of metamorphic rock. contact metamorphism is caused by large-scale geological events.

What is the author's purpose in this passagea. to remind people to avoid individuals who occasionally display bad manners. b. to encourage people to embrace the feeling of superiority over others. c. to persuade people to demonstrate good manners at all times. d. to convince people to freely express their emotions.