What does the third one in this worksheet means??

4.in those days the church was not merely a thermometer that recorded the ideas and principles of popular opinion; it was a thermostat that transformed the mores of society. •type of figurative language: •meaning of figurative language: •effect on tone and mood: •effect on audience: choose out of these: hyperbole, irony, historical question, paradox, allusion, metaphor, personification, symbolism and simile

Which statement contains an opinion? the ants serve to protect the acacia from other plants and herbivores. the acacia depends on pollinators for the exchange of genetic material. the acacia has no chemical defenses to discourage herbivores. the ants provide the acacia with the best protection from other plants and herbivores.

Based on what you have read, write two or three sentences explaining what the point of view in the memoir allows readers to learn about helen keller.